Commun. Korean Math. Soc. 2015; 30(4): 415-427
Printed October 31, 2015
https://doi.org/10.4134/CKMS.2015.30.4.415
Copyright © The Korean Mathematical Society.
Sang Il Choi and Yoon Hoe Goo
Hanseo University, Hanseo University
2020; 35(3): 879-890
2019; 34(1): 185-202
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