Amir Zaman Khan, P. Shah, Shad K. Khalil and F. H. Taj
Journal of Agronomy 2 ( 3 ): 146 - 152 , 2003
Shad K. Khalil, John G. Mexal and Leigh W. Murray
Journal of Biological Sciences 1 ( 3 ): 105 - 107 , 2001