TY  - JOUR
AU  - Grätzer, G.
AU  - Lakser, H.
AU  - Płonka, J.
TI  - Joins and Direct Products of Equational Classes
JO  - Canadian mathematical bulletin
PY  - 1969
SP  - 741
EP  - 744
VL  - 12
IS  - 6
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1969-095-x/
DO  - 10.4153/CMB-1969-095-x
ID  - 10_4153_CMB_1969_095_x
ER  -