Nazir Hussain, G.D. Khan, M. Tahir, F. Mujeeb, M. Arshad Ullah and Afzal Ahmad
Asian Journal of Plant Sciences 1 ( 1 ): 15 - 17 , 2002
G. Shabbir, Nazir Hussain, M. K. Bhatti, Afzal Ahmad, M. A. Javed and Masood Ahmad Shakir
Journal of Biological Sciences 1 ( 12 ): 1175 - 1177 , 2001