Bull. Korean Math. Soc. 2016; 53(6): 1879-1886
Online first article September 22, 2016 Printed November 30, 2016
https://doi.org/10.4134/BKMS.b151066
Copyright © The Korean Mathematical Society.
Kyeonghee Jo
Mokpo National Maritime University
2023; 60(4): 905-913
2010; 47(3): 455-465
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