Bull. Korean Math. Soc. 2016; 53(6): 1913-1915
Online first article November 1, 2016 Printed November 30, 2016
https://doi.org/10.4134/BKMS.b160513
Copyright © The Korean Mathematical Society.
Tai Keun Kwak and Yang Lee
Daejin University, Daejin University
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