Author: El-Metwally, H.

Elabbasy, E. M.; El-Metwally, H.; Elsayed, E. M.: On the difference equation $x_{n+1}=\dfrac{a_{0}x_{n}+a_{1}x_{n-1}+\dots +a_{k}x_{n-k}}{b_{0}x_{n}+b_{1}x_{n-1}+\dots +b_{k}x_{n-k}} $. (English). Mathematica Bohemica, vol. 133 (2008), issue 2, pp. 133-147
Grace, S. R.; Kulenović, M. R. S.; El-Metwally, H.: On the stability of solutions of certain systems of differential equations with piecewise constant argument. (English). Czechoslovak Mathematical Journal, vol. 52 (2002), issue 3, pp. 449-461