Unsteady temperature distribution in a cylinder made of functionally graded materials under circumferentially-varying convective heat transfer boundary conditions. - He, Fuli; Amiri Delouei, Amin; Ellahi, Rahmat; Alamri, Sultan Z.; Emamian, Amin; Ghorbani, Saeed (Zeitschrift für Naturforschung Section A: A Journal of Physical Sciences, 2023)