Abou-El-Ela, A. M. A.; Sadek, A. I.; Mahmoud, A. M. On the stability criteria of linear non-autonomous time-varying delay system with application to control problem. (English) Zbl 1412.34208 Differ. Uravn. Protsessy Upr. 2012, No. 1, 146-163 (2012). MSC: 34K20 93C23 93D15 PDFBibTeX XMLCite \textit{A. M. A. Abou-El-Ela} et al., Differ. Uravn. Protsessy Upr. 2012, No. 1, 146--163 (2012; Zbl 1412.34208) Full Text: Link
Abou-El-Ela, A. M. A.; Sadek, A. I.; Taie, R. O. A. Existence of periodic solutions to a third-order nonlinear delay differential equation. (English) Zbl 1265.34241 Ann. Differ. Equations 27, No. 4, 409-417 (2011). MSC: 34K13 34K40 47N20 PDFBibTeX XMLCite \textit{A. M. A. Abou-El-Ela} et al., Ann. Differ. Equations 27, No. 4, 409--417 (2011; Zbl 1265.34241)
Abou-El-Ela, A. M. A.; Sadek, A. I.; Mahmoud, A. M. On the stability of solutions of certain fourth-order nonlinear non-autonomous delay differential equation. (English) Zbl 1180.34076 Int. J. Appl. Math. 22, No. 2, 245-258 (2009). Reviewer: Cemil Tunç (Van) MSC: 34K20 PDFBibTeX XMLCite \textit{A. M. A. Abou-El-Ela} et al., Int. J. Appl. Math. 22, No. 2, 245--258 (2009; Zbl 1180.34076)
Abou-El-Ela, A. M. A.; Sadek, A. I. On the asymptotic behaviour of solutions of some differential equations of the fourth order. (English) Zbl 0757.34039 Ann. Differ. Equations 8, No. 1, 1-12 (1992). Reviewer: O.Akinyele (Ibadan) MSC: 34D05 34C11 34D40 PDFBibTeX XMLCite \textit{A. M. A. Abou-El-Ela} and \textit{A. I. Sadek}, Ann. Differ. Equations 8, No. 1, 1--12 (1992; Zbl 0757.34039)