J. Korean Math. Soc. 2011; 48(3): 465-474
Printed May 1, 2011
https://doi.org/10.4134/JKMS.2011.48.3.465
Copyright © The Korean Mathematical Society.
Xiaochun Chen and Sadek Gala
Chonqing Three Gorges University, University of Mostaganem
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