TY  - JOUR
AU  - M.V. Sapir
TI  - On cross semigroup varieties and related questions.
JO  - Semigroup forum
PY  - 1991
SP  - 345
EP  - 364
VL  - 42
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1991__42_3_135087/
ID  - SF_1991__42_3_135087
ER  -