[1] P. DUBREIL:
Contribution à la théorie des demi-groupes III. Bull. Soc. Math. France 81 (1953), 289-306.
MR 0060503 |
Zbl 0051.25304
[2] R. Mc KENZIE:
Cardinal multiplication of structures with a reflexive relation. Fund. Math. 70 (1971), 59-101.
MR 0280430
[3] V. KOUBEK J. NEŠETŘIL V. RÖDL:
Representing groups and semigroups by products in categories of relations. Algebra Universalis 4 (1974), 336-341.
MR 0357669
[4] V. TRNKOVÁ:
Representation of Semigroups by Products in a Category. J. of Algebra 34 (1975), 191-204.
MR 0367100
[5] V. TRNKOVÁ:
On a representation of commutative semigroups. Semigroup Forum 10 (1975), 203-214.
MR 0374312