TY  - JOUR
AU  - Chajda, Ivan
TI  - Every at most four element algebra has a Mal'cev theory for permutability
JO  - Mathematica slovaca
PY  - 1991
SP  - 35
EP  - 39
VL  - 41
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MASLO_1991__41_1_a5/
LA  - en
ID  - MASLO_1991__41_1_a5
ER  -