MathSciNet bibliographic data

MR2651882 (2011i:20107) 20N20 Anvariyeh, S. M.; Mirvakili, S.; Davvaz, B. Pawlak's approximations in $\Gamma$$\Gamma$-semihypergroups. Comput. Math. Appl. 60 (2010), no. 1, 45–53.

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