TY  - JOUR
AU  - E. V. Sukhanov
TI  - The groupoid of varieties of idempotent semigroups.
JO  - Semigroup forum
PY  - 1977
SP  - 143
EP  - 160
VL  - 14
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1977__14_186363/
ID  - SF_1977__14_186363
ER  -