Unification in Free Distributive Lattices. - J. A. Gerhard; Mario Petrich (Theor. Comput. Sci., 1994)

Compactness of Systems of Equations on Completely Regular Semigroups. - Tero Harju; Juhani Karhumäki; Mario Petrich (Structures in Logic and Computer Science, 1997)

Commutative cancellative semigroups of finite rank. - Antonio Martínez Cegarra; Mario Petrich (Period. Math. Hung., 2004)

Normal bands of commutative cancellative semigroups revisited. - Mario Petrich (Int. J. Algebra Comput., 2014)

Ladders and canonical varieties of completely regular semigroups. - Mario Petrich (Period. Math. Hung., 2018)