TY  - JOUR
AU  - K. A. Zaretskii
TI  - An abstract characterization of the bisemigroup of binary operations
JO  - Matematičeskie zametki
PY  - 1967
SP  - 525
EP  - 530
VL  - 1
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1967_1_5_a2/
LA  - ru
ID  - MZM_1967_1_5_a2
ER  -