Bull. Korean Math. Soc. 2014; 51(5): 1411-1423
Printed September 30, 2014
https://doi.org/10.4134/BKMS.2014.51.5.1411
Copyright © The Korean Mathematical Society.
Mujun Zhan and Guangfu Cao
GuangDong Pharmaceutical College, GuangDong Pharmaceutical College
2021; 58(5): 1261-1278
1995; 32(2): 251-257
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