%0 Journal Article %A Dymek, Grzegorz %T On a period of elements of pseudo-BCI-algebras %J Discussiones Mathematicae. General Algebra and Applications %D 2015 %P 21-31 %V 35 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DMGAA_2015_35_1_a1/ %G en %F DMGAA_2015_35_1_a1