Differential sandwich theorems for some subclasses of analytic functions involving a linear operator
By T. N. Shammugam, C. Ramachandran, Maslina Darus, Srikandan Sivasubramanian. 2007
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View Paper: https://www.semanticscholar.org/paper/a56dda736ca66414e2d636a7e43aace9e43636a0