%0 Journal Article %A Zelinka, Bohdan %T Tolerances on graph algebras %J Czechoslovak Mathematical Journal %D 1987 %P 313-317 %V 37 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1987.102157/ %R 10.21136/CMJ.1987.102157 %G en %F 10_21136_CMJ_1987_102157