Bull. Korean Math. Soc. 2014; 51(5): 1291-1297
Printed September 30, 2014
https://doi.org/10.4134/BKMS.2014.51.5.1291
Copyright © The Korean Mathematical Society.
Jie Ding and Lian-Zhong Yang
Taiyuan University of Technology, Shandong University
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