A. Avaei, Abdoul R. Ghotbi and M. Aryafar
American Journal of Engineering and Applied Sciences 1 ( 1 ): 76 - 81 , 2008
Abdoul R. Ghotbi, A. Avaei, A. Barari and M.A. Mohammadzade
Journal of Applied Sciences 8 ( 2 ): 322 - 327 , 2008
Abdoul R. Ghotbi, M. A. Mohammadzade, A. Avaei and M. Keyvanipoor
Journal of Mathematics and Statistics 3 ( 4 ): 201 - 206 , 2007