Author: Baayen, Cor P.

Baayen, Cor P.; Hedrlín, Zdeněk: Commutative polynomial semigroups on a segment. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 4 (1963), issue 4, pp. 173-179
Baayen, Cor P.; Hedrlín, Zdeněk: On the product and sum of a system of transformation semigroups. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 4 (1963), issue 1, pp. 29-42

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