@article{BMMS_2012_35_4_a17,
     author = {S. O. Dehkordi and B. Davvaz},
     title = {$\Gamma${-Semihyperrings:} {Approximations} and {Rough} {Ideals}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {2012},
     volume = {35},
     number = {4},
     url = {http://geodesic.mathdoc.fr/item/BMMS_2012_35_4_a17/}
}