Bull. Korean Math. Soc. 2016; 53(5): 1395-1399
Online first article August 25, 2016 Printed September 30, 2016
https://doi.org/10.4134/BKMS.b150719
Copyright © The Korean Mathematical Society.
Dong Seung Kang
Dankook University
2014; 51(4): 1205-1210
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