I.A. Hassan, S. Anttonen, M.R. Ashmore, J.N.B. Bell, J. Bender and H.J. Weigel
Pakistan Journal of Biological Sciences 2 ( 2 ): 332 - 335 , 1999
I. A. Hassan and S. Anttonen
Pakistan Journal of Biological Sciences 2 ( 2 ): 327 - 331 , 1999