@article(flaas,
 author       = "D. G. Fon-Der-Flaass and A. E. Frid",
 year         = "2007",
 title        = "On periodicity and low complexity of infinite permutations",
 journal      = "European J. Combin.",
 volume       = "28",
 number       = "8",
 pages        = "2106--2114",
 doi          = "10.1016/j.ejc.2007.04.017",
)
@phdthesis(frid,
 author       = "A.E. Frid",
 year         = "2000",
 title        = "On Combinatorial Properties of fixed points of morphisms",
 school       = "Ph.D. thesis, Novosibirsk",
)
@article(mak,
 author       = "M. A. Makarov",
 year         = "2006",
 title        = "On permutations generated by infinite binary words",
 journal      = "Sib. \`Elektron. Mat. Izv.",
 volume       = "3",
 pages        = "304--311 (electronic)",
)
@article(sturm,
 author       = "M. A. Makarov",
 year         = "2009",
 title        = "On permutations generated by {S}turmian words",
 journal      = "Sibirsk. Mat. Zh.",
 volume       = "50",
 number       = "4",
 pages        = "850--857",
 doi          = "10.1007/s11202-009-0076-6",
)
@article(widmer,
 author       = "S Widmer",
 year         = "2011",
 title        = "Permutation complexity of the Thue-Morse word",
 journal      = "Advances in Applied Mathematics",
 volume       = "47",
 number       = "2",
 pages        = "309--329",
 doi          = "10.1016/j.aam.2010.08.002",
)