Z.H. Maik, Ir. A.M. van Lieshout, S.K. Agha and G.M. Channar
Journal of Applied Sciences 3 ( 8-9 ): 572 - 578 , 2003
Z.H. Maik, W.G. Bastiaansseen, Ir. A.M. van Lieshout and N.A. Mughal
Journal of Applied Sciences 4 ( 1 ): 126 - 129 , 2004