TY  - JOUR
AU  - Jakubík, Ján
TI  - On directed groups with additional operations
JO  - Mathematica Bohemica
PY  - 1993
SP  - 11
EP  - 17
VL  - 118
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/MB.1993.126020/
DO  - 10.21136/MB.1993.126020
LA  - en
ID  - 10_21136_MB_1993_126020
ER  -