@article{CMJ_2005__55_4_a8,
     author = {Davvaz, B.},
     title = {Characterizations of sub-semihypergroups by various triangular norms},
     journal = {Czechoslovak Mathematical Journal},
     pages = {923--932},
     publisher = {mathdoc},
     volume = {55},
     number = {4},
     year = {2005},
     mrnumber = {2184373},
     zbl = {1081.20079},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2005__55_4_a8/}
}