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20.90 Semigroup algebras, representations, characters (2 articles)

• Higgins, John C.: A faithful canonical representation for finitely generated $N$-semigroups. (English). Czechoslovak Mathematical Journal, vol. 19 (1969), issue 3, pp. 375-379
• Parízek, Bohumír; Schwarz, Štefan: Semi-Characters of the Multiplicative Semigroup of Integers Modulo $m$. (English). Matematicko-fyzikálny časopis, vol. 11 (1961), issue 1, pp. 63-74