%0 Journal Article
%A Niederle, Josef
%T Transitivity of principal tolerances is not a Mal'cev property
%J Czechoslovak Mathematical Journal
%D 1990
%P 563-565
%V 40
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1990.102410/
%R 10.21136/CMJ.1990.102410
%G en
%F 10_21136_CMJ_1990_102410