Bull. Korean Math. Soc. 2018; 55(3): 809-818
Online first article March 9, 2018 Printed May 31, 2018
https://doi.org/10.4134/BKMS.b170265
Copyright © The Korean Mathematical Society.
Malik Tusif Ahmed, Tiberiu Dumitrescu
Abdus Salam School of Mathematical Sciences GCU Lahore, University of Bucharest
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