http://dewey.info/scheme/edition/e23/ en
512 Algebra
512.2 Groups and group theory
512.21 Permutation groups 512.22 Representations of groups 512.23 Finite groups 512.25 Abelian groups (Commutative groups) 512.27 Semigroups 512.28 Groupoids
http://dewey.info/scheme/edition/e22/ de
512 Algebra
512.2 Gruppen und Gruppentheorie
512.21 Permutationsgruppen 512.22 Darstellungen von Gruppen 512.23 Endliche Gruppen 512.25 Abelsche Gruppen (Kommutative Gruppen) 512.27 Halbgruppen 512.28 Gruppoide
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