I. Mahdavi, H. Fazlollahtabar, A. Heidarzade, N. Mahdavi-Amiri and Y.I. Rooshan
Journal of Applied Sciences 8 ( 24 ): 4603 - 4609 , 2008
M. Zandieh, I. Mahdavi and A. Bagheri
Journal of Applied Sciences 8 ( 24 ): 4650 - 4655 , 2008