Doostdar, M. R., Vahidi, A. R., Damercheli, T., & Babolian, E. (2022). A numerical method based on hybrid functions for solving a fractional model of HIV infection of CD4+\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$^+$$\end{document} T cells. Mathematical Sciences, 17(2 (June 2023). https://doi.org/10.1007/s40096-021-00450-0