“Exact Solutions of Time Fractional Free Convection Flows of Viscous Fluid over an Isothermal Vertical Plate With Caputo and Caputo-Fabrizio Derivatives”. Journal of Prime Research in Mathematics, vol. 13, no. 1, Dec. 2017, pp. 56 – 74, https://jprm.sms.edu.pk/index.php/jprm/article/view/132.