J. Korean Math. Soc. 2018; 55(4): 963-974
Online first article February 5, 2018 Printed July 1, 2018
https://doi.org/10.4134/JKMS.j170569
Copyright © The Korean Mathematical Society.
Jihong Bae, Jeonghyeong Park, Kouei Sekigawa
Sungkyunkwan University, Sungkyunkwan University, Niigata University
2018; 55(1): 161-174
2005; 42(5): 883-892
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