M. R. Doostdar, A. R. Vahidi, T. Damercheli, and E. Babolian, “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”, Math. Sci., vol. 17, no. 2 (June 2023), Jan. 2022, doi: 10.1007/s40096-021-00450-0.