J. Ratnasingam, T.P. Ma, M. Manikam and S.R. Farrokhpayam
Asian Journal of Applied Sciences 1 ( 4 ): 334 - 340 , 2008
J. Ratnasingam, T.P. Ma, G. Ramasamy and M. Manikam
Journal of Applied Sciences 9 ( 18 ): 3397 - 3401 , 2009