TY  - JOUR
AU  - D'Alarcao, Hugo
TI  - Biregular semigroups. I
JO  - Czechoslovak Mathematical Journal
PY  - 1970
SP  - 544
EP  - 548
VL  - 20
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1970.100982/
DO  - 10.21136/CMJ.1970.100982
LA  - en
ID  - 10_21136_CMJ_1970_100982
ER  -