Bull. Korean Math. Soc. 2012; 49(6): 1335-1348
Printed November 30, 2012
https://doi.org/10.4134/BKMS.2012.49.6.1335
Copyright © The Korean Mathematical Society.
Yingxiong Xiao
Hubei Engineering University
2008; 45(3): 405-417
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