Bull. Korean Math. Soc. 2017; 54(1): 43-50
Online first article January 4, 2017 Printed January 31, 2017
https://doi.org/10.4134/BKMS.b150339
Copyright © The Korean Mathematical Society.
Bin Zhang
Qufu Normal University
2015; 52(6): 1911-1924
2014; 51(4): 949-955
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