Author: Petrich, Mario

Petrich, Mario: Relations on a lattice of varieties of completely regular semigroups. (English). Mathematica Bohemica, vol. 145 (2020), issue 3, pp. 225-240
Petrich, Mario: A semilattice of varieties of completely regular semigroups. (English). Mathematica Bohemica, vol. 145 (2020), issue 1, pp. 1-14
Cegarra, Antonio M.; Petrich, Mario: The rank of a commutative semigroup. (English). Mathematica Bohemica, vol. 134 (2009), issue 3, pp. 301-318

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