[finished] Biswas, R., Nanda, S.: Rough Groups and Rough Subgroups. Bull. Pol. AC.: Math., 42 (1994) 251-254.

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[finished] Biswas, R., Nanda, S.: Rough Groups and Rough Subgroups. Bull. Pol. AC.: Math., 42 (1994) 251-254. Copy