TY  - JOUR
AU  - Behnaz Tolue
AU  - Parvaneh Zolfaghari
AU  - Gholamreza Moghaddasi
TI  - Free ultra-groups, generators and relations
JO  - Algebra and discrete mathematics
PY  - 2019
SP  - 308
EP  - 316
VL  - 28
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/ADM_2019_28_2_a12/
LA  - en
ID  - ADM_2019_28_2_a12
ER  -