An oscillation criterion for inhomogeneous Stieltjes integro-differential equations. El-Sayed, M.A. — 1994 International Journal of Mathematics and Mathematical Sciences
Stability problem of some nonlinear difference equations. Hamza, Alaa E.; El-Sayed, M.A. — 1998 International Journal of Mathematics and Mathematical Sciences
On a ( 2 , 2 ) -rational recursive sequence. Ben Rhouma, Mohamed; El-Sayed, M.A.; Khalifa, Azza K. — 2005 Advances in Difference Equations [electronic only]
Stability for a non-local non-autonomous system of fractional order differential equations with delays. El-Sayed, Ahmed M.A.; Gaafar, Fatma M.; Hamadalla, Eman M.A. — 2010 Electronic Journal of Differential Equations (EJDE) [electronic only]
On the stability of some fractional-order non-autonomous systems. Abd El-Salam, Sheren A.; El-Sayed, Ahmed M.A. — 2007 Electronic Journal of Qualitative Theory of Differential Equations [electronic only]