TY  - JOUR
AU  - Davvaz, B.
TI  - Characterizations of sub-semihypergroups by various triangular norms
JO  - Czechoslovak Mathematical Journal
PY  - 2005
SP  - 923
EP  - 932
VL  - 55
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMJ_2005__55_4_a8/
LA  - en
ID  - CMJ_2005__55_4_a8
ER  -