Geodesic
$\Gamma$-Semihyperrings: Approximations and Rough Ideals
Bulletin of the Malaysian Mathematical Society, Tome 35 (2012) no. 4 Cet article a éte moissonné depuis la source Bulletin of the Malaysian Mathematical Society website

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The notion of rough sets was introduced by Z. Pawlak in
Classification : 20N20, 16Y99. 
@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/}
}
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S. O. Dehkordi; B. Davvaz. $\Gamma$-Semihyperrings: Approximations and Rough Ideals. Bulletin of the Malaysian Mathematical Society, Tome 35 (2012) no. 4. http://geodesic.mathdoc.fr/item/BMMS_2012_35_4_a17/