M. Imtiaz, B.J. Alloway, K.H. Shah, S.H. Siddiqui, M.Y. Memon, M. Aslam and P. Khan
Asian Journal of Plant Sciences 2 ( 15 ): 1118 - 1120 , 2003
J. Nouri, P.J. Peterson and B.J. Alloway
Pakistan Journal of Biological Sciences 5 ( 2 ): 135 - 142 , 2002