K. Ahmed, F. Khalique and B. A. Malik
Pakistan Journal of Biological Sciences 1 ( 2 ): 105 - 108 , 1998
Muhammad Iqbal, K. Ahmed, I. Ahmad, M. Sadiq and M.Y. Ashraf
Pakistan Journal of Biological Sciences 2 ( 4 ): 1438 - 1440 , 1999