TY  - JOUR
AU  - Z. Hedrlín
TI  - Commutative systems as generalized semigroups
JO  - Doklady Akademii Nauk
PY  - 1965
SP  - 483
EP  - 486
VL  - 164
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1965_164_3_a1/
LA  - ru
ID  - DAN_1965_164_3_a1
ER  -