Bull. Korean Math. Soc. 2015; 52(6): 1911-1924
Printed November 30, 2015
https://doi.org/10.4134/BKMS.2015.52.6.1911
Copyright © The Korean Mathematical Society.
Bin Zhang and Yu Zhou
Qufu Normal University, Nanjing Normal University
2017; 54(1): 43-50
2014; 51(4): 949-955
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