@book {AbramenkoBrown08,
    AUTHOR = {Abramenko, Peter and Brown, Kenneth S.},
     TITLE = {Buildings. Theory and applications},
    SERIES = {Graduate Texts in Mathematics},
    VOLUME = {248},
 PUBLISHER = {Springer, New York},
      YEAR = {2008},
     PAGES = {xxii+747},
       URL = {https://doi.org/10.1007/978-0-387-78835-7},
}

@article {ACP11,
    AUTHOR = {Andersen, Kasper K. S. and Carbone, Lisa and Penta, Diego},
     TITLE = {Kac--{M}oody {F}ibonacci sequences, hyperbolic golden ratios,
              and real quadratic fields},
   JOURNAL = {J.~Comb. Number Theory},
  FJOURNAL = {Journal of Combinatorics and Number Theory},
    VOLUME = {2},
      YEAR = {2010},
    NUMBER = {3},
     PAGES = {245--278},
}

@article {BBMR95,
    AUTHOR = {Back-Valente, Val\'erie and Bardy-Panse, Nicole and Ben
              Messaoud, Hechmi and Rousseau, Guy},
     TITLE = {Formes presque-d\'eploy\'ees des alg\`ebres de {K}ac--{M}oody:
              classification et racines relatives},
   JOURNAL = {J.~Algebra},
  FJOURNAL = {Journal of Algebra},
    VOLUME = {171},
      YEAR = {1995},
    NUMBER = {1},
     PAGES = {43--96},
       URL = {https://doi.org/10.1006/jabr.1995.1004},
}

@article {Berman85,
    AUTHOR = {Berman, Stephen},
     TITLE = {Real forms of universal {K}ac--{M}oody {L}ie algebras},
   JOURNAL = {Algebras Groups Geom.},
  FJOURNAL = {Algebras, Groups and Geometries},
    VOLUME = {2},
      YEAR = {1985},
    NUMBER = {1},
     PAGES = {10--25},
}

@article {Borcherds86,
    AUTHOR = {Borcherds, Richard E.},
     TITLE = {Vertex algebras, {K}ac--{M}oody algebras, and the {M}onster},
   JOURNAL = {Proc. Nat. Acad. Sci. USA},
  FJOURNAL = {Proceedings of the National Academy of Sciences of the United
              States of America},
    VOLUME = {83},
      YEAR = {1986},
    NUMBER = {10},
     PAGES = {3068--3071},
       URL = {https://doi.org/10.1073/pnas.83.10.3068},
}

@article {Caprace09,
    AUTHOR = {Caprace, Pierre-Emmanuel},
     TITLE = {``{A}bstract'' homomorphisms of split {K}ac--{M}oody groups},
   JOURNAL = {Mem. Amer. Math. Soc.},
  FJOURNAL = {Memoirs of the American Mathematical Society},
    VOLUME = {198},
      YEAR = {2009},
    NUMBER = {924},
     PAGES = {xvi+84~pages},
       URL = {https://doi.org/10.1090/memo/0924},
}

@article {CG2003,
    AUTHOR = {Carbone, Lisa and Garland, Howard},
     TITLE = {Existence of lattices in {K}ac--{M}oody groups over finite
              fields},
   JOURNAL = {Commun. Contemp. Math.},
  FJOURNAL = {Communications in Contemporary Mathematics},
    VOLUME = {5},
      YEAR = {2003},
    NUMBER = {5},
     PAGES = {813--867},
       URL = {https://doi.org/10.1142/S0219199703001117},
}

@article {CKMS19,
    AUTHOR = {Carbone, Lisa and Kownacki, Matt and Murray, Scott H. and Srinivasan, Sowmya},
     TITLE = {Commutator relations and structure constants for rank 2 {K}ac--{M}oody algebras},
   JOURNAL = {J.~Algebra},
  FJOURNAL = {Journal of Algebra},
      NOTE = {{t}o appear},
    EPRINT = {1804.02308},
}

@article {Chevalley55,
    AUTHOR = {Chevalley, C.},
     TITLE = {Sur certains groupes simples},
   JOURNAL = {Tohoku Math.~J.},
  FJOURNAL = {The Tohoku Mathematical Journal. Second Series},
    VOLUME = {7},
      YEAR = {1955},
     PAGES = {14--66},
       URL = {https://doi.org/10.2748/tmj/1178245104},
}

@article {Dadok85,
    AUTHOR = {Dadok, Jiri},
     TITLE = {Polar coordinates induced by actions of compact {L}ie groups},
   JOURNAL = {Trans. Amer. Math. Soc.},
  FJOURNAL = {Transactions of the American Mathematical Society},
    VOLUME = {288},
      YEAR = {1985},
    NUMBER = {1},
     PAGES = {125--137},
       URL = {https://doi.org/10.2307/2000430},
}

@article {DamourHenneauxNicolai02,
    AUTHOR = {Damour, T. and Henneaux, M. and Nicolai, H.},
     TITLE = {{$E_{10}$} and a small tension expansion of {M} theory},
   JOURNAL = {Phys. Rev. Lett.},
  FJOURNAL = {Physical Review Letters},
    VOLUME = {89},
      YEAR = {2002},
    NUMBER = {22},
     PAGES = {221601, 4~pages},
       URL = {https://doi.org/10.1103/PhysRevLett.89.221601},
    EPRINT = {hep-th/0207267},
}

@article {DamourHillmann09,
    AUTHOR = {Damour, Thibault and Hillmann, Christian},
     TITLE = {Fermionic {K}ac--{M}oody billiards and supergravity},
   JOURNAL = {J.~High Energy Phys.},
  FJOURNAL = {Journal of High Energy Physics. A SISSA Journal},
    VOLUME = {2009},
      YEAR = {2009},
    NUMBER = {8},
     PAGES = {no.~8, 100, 55~pages},
       URL = {https://doi.org/10.1088/1126-6708/2009/08/100},
    EPRINT = {0906.3116},
}

@article {DamourKleinschmidtNicolai11,
    AUTHOR = {Damour, Thibault and Kleinschmidt, Axel and Nicolai, Hermann},
     TITLE = {Sugawara-type constraints in hyperbolic coset models},
   JOURNAL = {Comm. Math. Phys.},
  FJOURNAL = {Communications in Mathematical Physics},
    VOLUME = {302},
      YEAR = {2011},
    NUMBER = {3},
     PAGES = {755--788},
       URL = {https://doi.org/10.1007/s00220-011-1188-y},
    EPRINT = {0912.3491},
}

@article {DamourSpindel13,
    AUTHOR = {Damour, Thibault and Spindel, Philippe},
     TITLE = {Quantum supersymmetric cosmology and its hidden {K}ac--{M}oody
              structure},
   JOURNAL = {Classical Quantum Gravity},
  FJOURNAL = {Classical and Quantum Gravity},
    VOLUME = {30},
      YEAR = {2013},
    NUMBER = {16},
     PAGES = {162001, 7~pages},
       URL = {https://doi.org/10.1088/0264-9381/30/16/162001},
    EPRINT = {1304.6381},
}

@article {deMedtsGramlichHorn09,
    AUTHOR = {De Medts, Tom and Gramlich, Ralf and Horn, Max},
     TITLE = {Iwasawa decompositions of split {K}ac--{M}oody groups},
   JOURNAL = {J.~Lie Theory},
  FJOURNAL = {Journal of Lie Theory},
    VOLUME = {19},
      YEAR = {2009},
    NUMBER = {2},
     PAGES = {311--337},
}

@book {Eberlein96,
    AUTHOR = {Eberlein, Patrick B.},
     TITLE = {Geometry of nonpositively curved manifolds},
    SERIES = {Chicago Lectures in Mathematics},
 PUBLISHER = {University of Chicago Press, Chicago, IL},
      YEAR = {1996},
     PAGES = {vii+449},
}

@article {Feingold80,
    AUTHOR = {Feingold, Alex Jay},
     TITLE = {A hyperbolic {GCM} {L}ie algebra and the {F}ibonacci numbers},
   JOURNAL = {Proc. Amer. Math. Soc.},
  FJOURNAL = {Proceedings of the American Mathematical Society},
    VOLUME = {80},
      YEAR = {1980},
    NUMBER = {3},
     PAGES = {379--385},
       URL = {https://doi.org/10.2307/2043723},
}

@article {FeingoldFrenkel83,
    AUTHOR = {Feingold, Alex J. and Frenkel, Igor B.},
     TITLE = {A hyperbolic {K}ac--{M}oody algebra and the theory of {S}iegel
              modular forms of genus~{$2$}},
   JOURNAL = {Math. Ann.},
  FJOURNAL = {Mathematische Annalen},
    VOLUME = {263},
      YEAR = {1983},
    NUMBER = {1},
     PAGES = {87--144},
       URL = {https://doi.org/10.1007/BF01457086},
}

@phdthesis {Freyn09,
    AUTHOR = {Freyn, Walter},
     TITLE = {{K}ac--{M}oody symmetric spaces and universal twin buildings},
      NOTE = {{U}niversit\"at {A}ugsburg, 2009},
}

@mics {Freyn10b,
    AUTHOR = {Freyn, Walter},
     TITLE = {Functional analytic methods for cities},
      NOTE = {unpublished, 2011},
}

@incollection {Freyn10a,
    AUTHOR = {Freyn, Walter},
     TITLE = {Kac--{M}oody geometry},
 BOOKTITLE = {Global Differential Geometry},
    SERIES = {Springer Proc. Math.},
    VOLUME = {17},
     PAGES = {55--92},
 PUBLISHER = {Springer, Heidelberg},
      YEAR = {2012},
       URL = {https://doi.org/10.1007/978-3-642-22842-1_3},
    EPRINT = {1003.4435},
}

@article {Freyn10d,
    AUTHOR = {Freyn, Walter},
     TITLE = {Kac--{M}oody groups, infinite dimensional differential geometry
              and cities},
   JOURNAL = {Asian~J. Math.},
  FJOURNAL = {Asian Journal of Mathematics},
    VOLUME = {16},
      YEAR = {2012},
    NUMBER = {4},
     PAGES = {607--636},
       URL = {https://doi.org/10.4310/AJM.2012.v16.n4.a3},
}

@article {Freyn14,
    AUTHOR = {Freyn, Walter},
     TITLE = {Tame {F}r\'echet structures for affine {K}ac--{M}oody groups},
   JOURNAL = {Asian~J. Math.},
  FJOURNAL = {Asian Journal of Mathematics},
    VOLUME = {18},
      YEAR = {2014},
    NUMBER = {5},
     PAGES = {885--928},
       URL = {https://doi.org/10.4310/AJM.2014.v18.n5.a6},
}

@article {Freyn15,
    AUTHOR = {Freyn, Walter},
     TITLE = {Orthogonal symmetric affine {K}ac--{M}oody algebras},
   JOURNAL = {Trans. Amer. Math. Soc.},
  FJOURNAL = {Transactions of the American Mathematical Society},
    VOLUME = {367},
      YEAR = {2015},
    NUMBER = {10},
     PAGES = {7133--7159},
       URL = {https://doi.org/10.1090/tran/6257},
    EPRINT = {1305.3137},
}

@article {FreynHartnickHornKoehl17,
    AUTHOR = {Freyn, Walter and Hartnick, Tobias and Horn, Max and K\"ohl, Ralf},
     TITLE = {{K}ac--{M}oody symmetric spaces},
   JOURNAL = {M\"unster~J. Math.},
  FJOURNAL = {M\"unster Journal of Mathematics},
    VOLUME = {13},
      YEAR = {2020},
    NUMBER = {1},
     PAGES = {1--114},
       URL = {https://doi.org/10.17879/32109566476},
    EPRINT = {1702.08426},
}

@article {Freyn15b,
    AUTHOR = {Freyn, Walter},
     TITLE = {Tame {F}r\'echet submanifolds of co-{B}anach type},
   JOURNAL = {Forum Math.},
  FJOURNAL = {Forum Mathematicum},
    VOLUME = {27},
      YEAR = {2015},
    NUMBER = {4},
     PAGES = {2467--2490},
       URL = {https://doi.org/10.1515/forum-2012-0154},
    EPRINT = {1305.3145},
}

@article {GabberKac81,
    AUTHOR = {Gabber, Ofer and Kac, Victor G.},
     TITLE = {On defining relations of certain infinite-dimensional {L}ie
              algebras},
   JOURNAL = {Bull. Amer. Math. Soc. (N.S.)},
  FJOURNAL = {American Mathematical Society. Bulletin. New Series},
    VOLUME = {5},
      YEAR = {1981},
    NUMBER = {2},
     PAGES = {185--189},
       URL = {https://doi.org/10.1090/S0273-0979-1981-14940-5},
}

@article {Gross00,
    AUTHOR = {Gro{\ss}, Christian},
     TITLE = {{$s$}-representations for involutions on affine {K}ac--{M}oody
              algebras are polar},
   JOURNAL = {Manuscripta Math.},
  FJOURNAL = {Manuscripta Mathematica},
    VOLUME = {103},
      YEAR = {2000},
    NUMBER = {3},
     PAGES = {339--350},
       URL = {https://doi.org/10.1007/PL00005860},
}

@article {HainkeKoehlLevy15,
    AUTHOR = {Hainke, Guntram and K\"{o}hl, Ralf and Levy, Paul},
     TITLE = {Generalized spin representations},
   JOURNAL = {M\"{u}nster~J. Math.},
  FJOURNAL = {M\"{u}nster Journal of Mathematics},
    VOLUME = {8},
      YEAR = {2015},
    NUMBER = {1},
     PAGES = {181--210},
       URL = {https://doi.org/10.17879/65219674985},
    EPRINT = {1110.5576},
}

@article {Heintze06,
    AUTHOR = {Heintze, Ernst},
     TITLE = {Toward symmetric spaces of affine {K}ac--{M}oody type},
   JOURNAL = {Int.~J. Geom. Methods Mod. Phys.},
  FJOURNAL = {International Journal of Geometric Methods in Modern Physics},
    VOLUME = {3},
      YEAR = {2006},
    NUMBER = {5-6},
     PAGES = {881--898},
       URL = {https://doi.org/10.1142/S0219887806001648},
}

@incollection {HPTT,
    AUTHOR = {Heintze, Ernst and Palais, Richard S. and Terng, Chuu-Lian and
              Thorbergsson, Gudlaugur},
     TITLE = {Hyperpolar actions on symmetric spaces},
 BOOKTITLE = {Geometry, Topology, \& Physics},
    SERIES = {Conf. Proc. Lecture Notes Geom. Topology, IV},
     PAGES = {214--245},
 PUBLISHER = {Int. Press, Cambridge, MA},
      YEAR = {1995},
}

@book {Helgason01,
    AUTHOR = {Helgason, Sigurdur},
     TITLE = {Differential geometry, {L}ie groups, and symmetric spaces},
    SERIES = {Graduate Studies in Mathematics},
    VOLUME = {34},
 PUBLISHER = {Amer. Math. Soc., Providence, RI},
      YEAR = {2001},
     PAGES = {xxvi+641},
       URL = {https://doi.org/10.1090/gsm/034},
}

@mics {Horn09,
    AUTHOR = {Horn, M.},
     TITLE = {Involutions of {K}ac--{M}oody groups},
      NOTE = {{T}echnische {U}niversit\"at {D}armstadt, 2009},
}

@incollection {Julia85,
    AUTHOR = {Julia, Bernard},
     TITLE = {Kac--{M}oody symmetry of gravitation and supergravity theories},
 BOOKTITLE = {Applications of Group Theory in Physics and Mathematical
              Physics ({C}hicago, 1982)},
    SERIES = {Lectures in Appl. Math.},
    VOLUME = {21},
     PAGES = {355--373},
 PUBLISHER = {Amer. Math. Soc., Providence, RI},
      YEAR = {1985},
}

@incollection {KMW88,
    AUTHOR = {Kac, V. G. and Moody, R. V. and Wakimoto, M.},
     TITLE = {On {$E_{10}$}},
 BOOKTITLE = {Differential Geometrical Methods in Theoretical Physics
              ({C}omo, 1987)},
    SERIES = {NATO Adv. Sci. Inst. Ser. C Math. Phys. Sci.},
    VOLUME = {250},
     PAGES = {109--128},
 PUBLISHER = {Kluwer Acad. Publ., Dordrecht},
      YEAR = {1988},
}

@book {Kac90,
    AUTHOR = {Kac, V. G.},
     TITLE = {Infinite-dimensional {L}ie algebras},
   EDITION = {Third},
 PUBLISHER = {Cambridge University Press, Cambridge},
      YEAR = {1990},
     PAGES = {xxii+400},
       URL = {https://doi.org/10.1017/CBO9780511626234},
}

@article {KacPeterson85c,
    AUTHOR = {Kac, V. G. and Peterson, D. H.},
     TITLE = {Defining relations of certain infinite-dimensional groups},
   JOURNAL = {Ast\'erisque},
  FJOURNAL = {Ast\'erisque},
      YEAR = {1985},
    NUMBER = {Num\'ero Hors S\'erie},
     PAGES = {Num\'ero Hors S\'erie, 165--208},
}

@incollection {KacPeterson87,
    AUTHOR = {Kac, V. G. and Peterson, D. H.},
     TITLE = {On geometric invariant theory for infinite-dimensional groups},
 BOOKTITLE = {Algebraic Groups {U}trecht 1986},
    SERIES = {Lecture Notes in Math.},
    VOLUME = {1271},
     PAGES = {109--142},
 PUBLISHER = {Springer, Berlin},
      YEAR = {1987},
       URL = {https://doi.org/10.1007/BFb0079235},
}

@article {KacWang92,
    AUTHOR = {Kac, V. G. and Wang, S. P.},
     TITLE = {On automorphisms of {K}ac--{M}oody algebras and groups},
   JOURNAL = {Adv. Math.},
  FJOURNAL = {Advances in Mathematics},
    VOLUME = {92},
      YEAR = {1992},
    NUMBER = {2},
     PAGES = {129--195},
       URL = {https://doi.org/10.1016/0001-8708(92)90063-Q},
}

@article {KangMelville95,
    AUTHOR = {Kang, Seok-Jin and Melville, Duncan J.},
     TITLE = {Rank {$2$} symmetric hyperbolic {K}ac--{M}oody algebras},
   JOURNAL = {Nagoya Math.~J.},
  FJOURNAL = {Nagoya Mathematical Journal},
    VOLUME = {140},
      YEAR = {1995},
     PAGES = {41--75},
       URL = {https://doi.org/10.1017/S0027763000005419},
}

@article {KleinschmidtNicolai13,
    AUTHOR = {Kleinschmidt, Axel and Nicolai, Hermann},
     TITLE = {On higher spin realizations of {$K(E_{10})$}},
   JOURNAL = {J.~High Energy Phys.},
  FJOURNAL = {Journal of High Energy Physics},
    VOLUME = {2013},
      YEAR = {2013},
    NUMBER = {8},
     PAGES = {no.~8, 041, 28~pages},
       URL = {https://doi.org/10.1007/JHEP08(2013)041},
    EPRINT = {1307.0413},
}

@article {KleinschmidtPalmkvistNicolai12,
    AUTHOR = {Kleinschmidt, Axel and Nicolai, Hermann and Palmkvist, Jakob},
     TITLE = {Modular realizations of hyperbolic {W}eyl groups},
   JOURNAL = {Adv. Theor. Math. Phys.},
  FJOURNAL = {Advances in Theoretical and Mathematical Physics},
    VOLUME = {16},
      YEAR = {2012},
    NUMBER = {1},
     PAGES = {97--148},
       URL = {https://doi.org/10.4310/ATMP.2012.v16.n1.a4},
    EPRINT = {1010.2212},
}

@article {Kramer02,
    AUTHOR = {Kramer, Linus},
     TITLE = {Loop groups and twin buildings},
   JOURNAL = {Geom. Dedicata},
  FJOURNAL = {Geometriae Dedicata},
    VOLUME = {92},
      YEAR = {2002},
     PAGES = {145--178},
       URL = {https://doi.org/10.1023/A:1019603827308},
    EPRINT = {math.GT/0109128},
}

@book {Kumar02,
    AUTHOR = {Kumar, Shrawan},
     TITLE = {Kac--{M}oody groups, their flag varieties and representation
              theory},
    SERIES = {Progress in Mathematics},
    VOLUME = {204},
 PUBLISHER = {Birkh\"{a}user Boston, Inc., Boston, MA},
      YEAR = {2002},
     PAGES = {xvi+606},
       URL = {https://doi.org/10.1007/978-1-4612-0105-2},
}

@article {LepowskyMoody79,
    AUTHOR = {Lepowsky, James and Moody, Robert V.},
     TITLE = {Hyperbolic {L}ie algebras and quasiregular cusps on {H}ilbert
              modular surfaces},
   JOURNAL = {Math. Ann.},
  FJOURNAL = {Mathematische Annalen},
    VOLUME = {245},
      YEAR = {1979},
    NUMBER = {1},
     PAGES = {63--88},
       URL = {https://doi.org/10.1007/BF01420431},
}

@book {Marquis18,
    AUTHOR = {Marquis, Timoth\'ee},
     TITLE = {An introduction to {K}ac--{M}oody groups over fields},
    SERIES = {EMS Textbooks in Mathematics},
 PUBLISHER = {European Math. Soc. (EMS), Z\"{u}rich},
      YEAR = {2018},
     PAGES = {xi+331},
       URL = {https://doi.org/10.4171/187},
}

@article {Mitchell88,
    AUTHOR = {Mitchell, Stephen A.},
     TITLE = {Quillen's theorem on buildings and the loops on a symmetric
              space},
   JOURNAL = {Enseign. Math.},
  FJOURNAL = {L'Enseignement Math\'ematique. Revue Internationale. 2e S\'erie},
    VOLUME = {34},
      YEAR = {1988},
    NUMBER = {1-2},
     PAGES = {123--166},
}

@book {Moody95,
    AUTHOR = {Moody, Robert V. and Pianzola, Arturo},
     TITLE = {Lie algebras with triangular decompositions},
    SERIES = {Canadian Mathematical Society Series of Monographs and
              Advanced Texts},
 PUBLISHER = {John Wiley \& Sons, Inc., New York},
      YEAR = {1995},
     PAGES = {xxii+685},
}

@article {Morita88,
    AUTHOR = {Morita, Jun},
     TITLE = {Root strings with three or four real roots in {K}ac--{M}oody
              root systems},
   JOURNAL = {Tohoku Math.~J.},
  FJOURNAL = {The Tohoku Mathematical Journal. Second Series},
    VOLUME = {40},
      YEAR = {1988},
    NUMBER = {4},
     PAGES = {645--650},
       URL = {https://doi.org/10.2748/tmj/1178227928},
}

@phdthesis {Penta16,
    AUTHOR = {Penta, Diego A.},
     TITLE = {Decomposition of the rank 3 {K}ac--{M}oody {L}ie algebra {F}
              with respect to the rank 2 hyperbolic subalgebra {F}ib},
      NOTE = {{S}tate University of New York at Binghamton, 2016},
    EPRINT = {1605.06901},
}

@book {PressleySegal86,
    AUTHOR = {Pressley, Andrew and Segal, Graeme},
     TITLE = {Loop groups},
    SERIES = {Oxford Mathematical Monographs},
 PUBLISHER = {The Clarendon Press, Oxford University Press, New York},
      YEAR = {1986},
     PAGES = {viii+318},
}

@article {Remy02,
    AUTHOR = {R\'emy, Bertrand},
     TITLE = {Groupes de {K}ac--{M}oody d\'eploy\'es et presque d\'eploy\'es},
   JOURNAL = {Ast\'erisque},
  FJOURNAL = {Ast\'erisque},
    VOLUME = {277},
      YEAR = {2002},
     PAGES = {viii+348},
}

@book {Ronan89,
    AUTHOR = {Ronan, Mark},
     TITLE = {Lectures on buildings: updated and revised},
    SERIES = {Perspectives in Mathematics},
    VOLUME = {7},
 PUBLISHER = {University of Chicago Press, Chicago},
      YEAR = {2009},
     PAGES = {xiii+248},
}

@article {RonanTits94,
    AUTHOR = {Ronan, M. A. and Tits, J.},
     TITLE = {Twin trees.~{I}},
   JOURNAL = {Invent. Math.},
  FJOURNAL = {Inventiones Mathematicae},
    VOLUME = {116},
      YEAR = {1994},
    NUMBER = {1-3},
     PAGES = {463--479},
       URL = {https://doi.org/10.1007/BF01231569},
}

@mics {Tich14,
    AUTHOR = {Tichai, A.},
     TITLE = {Some lightcone embeddings of {L}orentzian {K}ac--{M}oody algebras},
      NOTE = {{M}asters Thesis, {T}echnische {U}niversit\"at {D}armstadt, 2014},
}

@article {Tits86b,
    AUTHOR = {Tits, Jacques},
     TITLE = {Ensembles ordonn\'es, immeubles et sommes amalgam\'ees},
   JOURNAL = {Bull. Soc. Math. Belg. S\'er.~A},
  FJOURNAL = {Bulletin de la Soci\'et\'e Math\'ematique de Belgique. S\'erie A},
    VOLUME = {38},
      YEAR = {1986},
     PAGES = {367--387},
}

@article {Tits87,
    AUTHOR = {Tits, Jacques},
     TITLE = {Uniqueness and presentation of {K}ac--{M}oody groups over
              fields},
   JOURNAL = {J.~Algebra},
  FJOURNAL = {Journal of Algebra},
    VOLUME = {105},
      YEAR = {1987},
    NUMBER = {2},
     PAGES = {542--573},
       URL = {https://doi.org/10.1016/0021-8693(87)90214-6},
}

@article {Tits96,
    AUTHOR = {Tits, Jacques},
     TITLE = {Th\'eorie des groupes},
   JOURNAL = {Ann. Coll\`ege France},
  FJOURNAL = {Annuaire du Coll\`ege de France},
    VOLUME = {87},
      YEAR = {1986},
     PAGES = {89--98},
}

@article {West01,
    AUTHOR = {West, P.},
     TITLE = {{$E_{11}$} and {M} theory},
   JOURNAL = {Classical Quantum Gravity},
  FJOURNAL = {Classical and Quantum Gravity},
    VOLUME = {18},
      YEAR = {2001},
    NUMBER = {21},
     PAGES = {4443--4460},
       URL = {https://doi.org/10.1088/0264-9381/18/21/305},
    EPRINT = {hep-th/0104081},
}
