Bull. Korean Math. Soc. 2018; 55(5): 1339-1350
Online first article June 12, 2018 Printed September 30, 2018
https://doi.org/10.4134/BKMS.b170760
Copyright © The Korean Mathematical Society.
Sun Hyang Chun, JeongHyeong Park, Kouei Sekigawa
Chosun University, Sungkyunkwan University, Niigata University
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