Functions with preclosed graphs. Bandyopadhyay, Nandini; Bhattacharyya, P. — 2005 Bulletin of the Malaysian Mathematical Sciences Society. Second Series
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Some theorems on the explicit evaluation of Ramanujan's theta-functions. Baruah, Nayandeep Deka; Bhattacharyya, P. — 2004 International Journal of Mathematics and Mathematical Sciences