Bull. Korean Math. Soc. 2016; 53(6): 1909-1911
Online first article November 3, 2016 Printed November 30, 2016
https://doi.org/10.4134/BKMS.b160197
Copyright © The Korean Mathematical Society.
Yi-Ling Cang and Jin-Lin Liu
Suqian College, Yangzhou University
2016; 53(1): 215-225
2014; 51(3): 659-666
2015; 52(6): 1937-1943
2005; 42(3): 623-629
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