Bull. Korean Math. Soc. 2019; 56(2): 303-303
Online first article March 19, 2019 Printed March 1, 2019
https://doi.org/10.4134/BKMS.b170803
Copyright © The Korean Mathematical Society.
Soodabeh Madadi-Dargahi, Mohammad Ali Nasr-Azadani
Shahed University; Shahed University
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