Bull. Korean Math. Soc. 2010; 47(5): 883-888
Printed September 1, 2010
https://doi.org/10.4134/BKMS.2010.47.5.883
Copyright © The Korean Mathematical Society.
Sh. Ghalandarzadeh, H. Haj Seyyed Javadi, M. Khoramdel, and M. Shamsaddini Fard
K. N. Toosi University of Technology, Shahed University, K. N. Toosi University of Technology, K. N. Toosi University of Technology
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