P.I. Urkimbaeva, U.M. Yessimkanova, R.K. Rakhmetullayeva, Zh.R. Urkimbaeva, A.K. Toktabayeva, El-Sayed Negim and G.A. Mun
Journal of Engineering and Applied Sciences 10 ( 7 ): 197 - 202 , 2015