Surath Ghosh และ Sunil Kumar. (2021) Numerical Solutions of Fractional Covid-19 Model Using Spectral Collocation Method. <i>Science & Technology Asia</i>, <i>26</i>(4), 1-12.Surath Ghosh และ Sunil Kumar. "Numerical Solutions of Fractional Covid-19 Model Using Spectral Collocation Method". Science & Technology Asia 26 (2021):1-12.Surath Ghosh และ Sunil Kumar. Numerical Solutions of Fractional Covid-19 Model Using Spectral Collocation Method. Research Administration Division:ม.ป.ท. 2021.