A penalty method with trust-region mechanism for nonlinear bilevel optimization problem. - Bothina El-Sobky; Yousria Abo-Elnaga (J. Comput. Appl. Math., 2018)

Enhanced Genetic Algorithm and Chaos Search for Bilevel Programming Problems. - Yousria Abo-Elnaga; Sarah M. Nasr; I. M. El-Desoky; Z. M. Hendawy; Abd Allah A. Mousa (AMLTA, 2019)

Multi-Sine Cosine Algorithm for Solving Nonlinear Bilevel Programming Problems. - Yousria Abo-Elnaga; Mohammed A. El-Shorbagy (Int. J. Comput. Intell. Syst., 2020)

Modified Evolutionary Algorithm and Chaotic Search for Bilevel Programming Problems. - Yousria Abo-Elnaga; Sarah M. Nasr (Symmetry, 2020)