Bull. Korean Math. Soc. -0001; 31(1): 177-184
Printed November 30, -0001
Copyright © The Korean Mathematical Society.
Xi Fu and Bowen Lu
Shaoxing University, Zhejiang International Studies University
2018; 55(2): 359-366
2015; 52(1): 149-157
2012; 49(2): 263-270
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