TY  - JOUR
AU  - Yaqub, Adil
TI  - On the equational interdefinability of certain operations
JO  - Portugaliae mathematica
PY  - 1967
SP  - 125
EP  - 131
VL  - 26
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/PORMA_1967__26_2_115010/
LA  - en
ID  - PORMA_1967__26_2_115010
ER  -