Nazir Hussain, M. Anwar Zaka, M. Tahir, M. Arshad Ullah and Zahid Saeed
Journal of Agronomy 1 ( 2 ): 77 - 79 , 2002
E. H. Chaudhary, A. M. Ranjha, S. M. Mehdi, M. A. Zaka and M. Sarfraz
Pakistan Journal of Biological Sciences 7 ( 3 ): 415 - 418 , 2004