Commun. Korean Math. Soc. 2020; 35(4): 1319-1327
Online first article August 4, 2020 Printed October 31, 2020
https://doi.org/10.4134/CKMS.c200089
Copyright © The Korean Mathematical Society.
Joonhyung Kim, Qianghua Luo
Chungnam National University; Hunan University
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