%0 Journal Article %A Novotný, Miroslav %T On some constructions of algebraic objects %J Czechoslovak Mathematical Journal %D 2006 %P 389-402 %V 56 %N 2 %I mathdoc %U https://geodesic-test.mathdoc.fr/item/CMJ_2006__56_2_a8/ %G en %F CMJ_2006__56_2_a8