%0 Journal Article
%A Grätzer, G.
%A Lakser, H.
%A Płonka, J.
%T Joins and Direct Products of Equational Classes
%J Canadian mathematical bulletin
%D 1969
%P 741-744
%V 12
%N 6
%U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1969-095-x/
%R 10.4153/CMB-1969-095-x
%F 10_4153_CMB_1969_095_x