Bull. Korean Math. Soc. 2018; 55(3): 699-715
Online first article April 27, 2018 Printed May 31, 2018
https://doi.org/10.4134/BKMS.b170015
Copyright © The Korean Mathematical Society.
Kun Du
Lanzhou University
2017; 54(5): 1851-1857
2015; 52(3): 735-740
2013; 50(6): 1989-2000
2006; 43(2): 245-252
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