Haviar, Alfonz

Weak subgroupoid lattices / Alfonz Haviar, Miroslav Haviar

In Mathematica Slovaca. -- Bratislava : Slovenská akadémia vied, Matematický ústav SAV, 2014. -- ISSN 0139-9918. -- ISSN 1337-2211. -- Vol. 64, no. 3 (2014), pp. 665-674