@article(BePe55,
 author       = "Ross A. Beaumont and Raymond P. Peterson",
 year         = "1955",
 title        = "Set-transitive permutation groups",
 journal      = "Canadian Journal of Mathematics",
 volume       = "7",
 pages        = "35--42",
 doi          = "10.4153/CJM-1955-005-x",
)
@unpublished(BrDa13,
 author       = "Janusz Brzozowski and Gareth Davies",
 year         = "2013",
 title        = "Maximal Syntactic Complexity of Regular Languages Implies Maximal Quotient Complexities of Atoms",
 url          = "http://arxiv.org/abs/1302.3906",
)
@article(BrTa13,
 author       = "Janusz Brzozowski and Hellis Tamm",
 year         = "2013",
 title        = "Complexity of Atoms of Regular Languages",
 journal      = "Int. J. Found. Comput. Sci.",
 volume       = "24",
 number       = "7",
 pages        = "1009--1027",
 doi          = "10.1142/S0129054113400285",
)
@article(BrTa14,
 author       = "Janusz Brzozowski and Hellis Tamm",
 year         = "2014",
 title        = "Theory of \'Atomata",
 journal      = "Theoret. Comput. Sci.",
 doi          = "10.1016/j.tcs.2014.04.016",
 note         = "In press.",
)
@unpublished(Ivan14,
 author       = "Szabolcs Iv\'an",
 year         = "2014",
 title        = "Handle Atoms with Care",
 url          = "http://arxiv.org/abs/1404.6632",
)
@article(LiWa65,
 author       = "Donald Livingstone and Ascher Wagner",
 year         = "1965",
 title        = "Transitivity of finite permutation groups on unordered sets",
 journal      = "Mathematische Zeitschrift",
 volume       = "90",
 number       = "5",
 pages        = "393--403",
 doi          = "10.1007/BF01112361",
)
@article(Mc98,
 author       = "Donald B. McAlister",
 year         = "1998",
 title        = "Semigroups generated by a group and an idempotent",
 journal      = "Communications in Algebra",
 volume       = "26",
 number       = "2",
 pages        = "243--254",
 doi          = "10.1080/00927879808826145",
)