%0 Journal Article
%A Chajda, Ivan
%T On Grätzer's problem of binary 1-step congruence schemes
%J Czechoslovak Mathematical Journal
%D 1989
%P 470-476
%V 39
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1989.102318/
%R 10.21136/CMJ.1989.102318
%G en
%F 10_21136_CMJ_1989_102318