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Clifford semigroups; semiheaps; generalised heaps; heaps

References:

[1] Baer R.: **Zur Einführung des Scharbegriffs**. J. Reine Angew. Math. 160 (1929), 199–207.

[2] Hawthorn I., Stokes T.: **Radical decompositions of semiheaps**. Comment. Math. Univ. Carolin. 50 (2009), 191–208. MR 2537831 | Zbl 1204.20087

[3] Howie J.M.: **Fundamentals of Semigroup Theory**. Oxford University Press, Oxford, 1995. MR 1455373 | Zbl 0835.20077

[4] Prüfer H.: **Theorie der Abelschen Gruppen**. Math. Z. 20 (1924), 165–187. DOI 10.1007/BF01188079 | MR 1544670

[5] Wagner V.V.: **The theory of generalized heaps and generalized groups**. (Russian), Mat. Sbornik N.S. 32 (1953), 545–632. MR 0059267

[6] Wagner V.V.: **On the algebraic theory of coordinate atlases, II**. (Russian), Trudy Sem. Vektor. Tenzor. Anal. 14 (1968), 229–281. MR 0253970