@article{BMMS_2000_23_1_a5,
     author = {Bijan Davvaz},
     title = {Some
                          {Results} on {Congruences} on {Semihypergroups}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {2000},
     volume = {23},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/BMMS_2000_23_1_a5/}
}