High-order Gegenbauer integral spectral element method integrated with an adaptive Chebyshev optimization strategy for solving linear singularly perturbed differential equations. - Kareem T. Elgindy; Hareth M. Refat (J. Comput. Appl. Math., 2020)

A Direct Integral Pseudospectral Method for Solving a Class of Infinite-Horizon Optimal Control Problems Using Gegenbauer Polynomials and Certain Parametric Maps. - Kareem T. Elgindy; Hareth M. Refat (CoRR, 2022)

Direct integral pseudospectral and integral spectral methods for solving a class of infinite horizon optimal output feedback control problems using rational and exponential Gegenbauer polynomials. - Kareem T. Elgindy; Hareth M. Refat (Math. Comput. Simul., 2024)