Analysis of unsteady natural convective radiating gas flow in a vertical channel by employing the Caputo time-fractional derivativeBakhtiar Ahmad, Syed Inayat Ali Shah, Sami Ul Haq and Nehad Ali ShahEur. Phys. J. Plus, 132 9 (2017) 380DOI: https://doi.org/10.1140/epjp/i2017-11651-1