Commun. Korean Math. Soc. 2015; 30(3): 169-176
Printed July 31, 2015
https://doi.org/10.4134/CKMS.2015.30.3.169
Copyright © The Korean Mathematical Society.
Abdolaziz Abdollahi and Mohammad Taghi Heydari
Shiraz University, Yasouj University
2005; 20(4): 703-708
2019; 34(4): 1135-1143
2018; 33(3): 787-798
2017; 32(1): 55-64
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