Numerical solution of a class of Caputo–Fabrizio derivative problem using Haar wavelet collocation methodBachir Dehda، Abdelaziz Azeb Ahmed، Fares Yazid، Fatima Siham DjeradiJournal of Applied Mathematics and Computingالمجلّد 69، (3)، الصفحات 2761-27742023مقال وصول مغلق 4