Commun. Korean Math. Soc. 2016; 31(4): 819-825
Online first article September 28, 2016 Printed October 31, 2016
https://doi.org/10.4134/CKMS.c150249
Copyright © The Korean Mathematical Society.
Ismail Nikoufar
Payame Noor University
2023; 38(3): 967-982
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