Alaa Mohsin Abed, Murtadha A. Kadhim and Shaymaa Maki Kadham (2026) “Study of descriptor multi-fractional integro-differential order nonlinear system by homotopy perturbation method”, Results in Nonlinear Analysis, 8(4), pp. 81–96. Available at: https://nonlinear-analysis.com/index.php/pub/article/view/829 (Accessed: 3 February 2026).