Bull. Korean Math. Soc. 2003; 40(4): 641-648
Printed December 1, 2003
Copyright © The Korean Mathematical Society.
Liu Jinxia, Minhyung Cho, and Li Linsong
Jimei University, Kumoh National Institute of Technology, Seoul National University
2016; 53(2): 541-550
2011; 48(2): 315-324
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