%0 Journal Article %A Zelinka, Bohdan %T Tolerance in algebraic structures %J Czechoslovak Mathematical Journal %D 1970 %P 179-183 %V 20 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1970.100959/ %R 10.21136/CMJ.1970.100959 %G en %F 10_21136_CMJ_1970_100959