Riaz A. Wahed, P. Moutonnet, M. Y. Ashraf, M. H.Naqvi, C.Kirda, G. R. Tahir, A. R. Awan and M. M.Iqbal
Journal of Biological Sciences 1 ( 6 ): 468 - 471 , 2001
Riaz A. Wahed and Hafiz A. Bilal
Pakistan Journal of Biological Sciences 2 ( 3 ): 1083 - 1084 , 1999