“GALERKIN SPECTRAL METHOD FOR HIGHER-ORDER BOUNDARY VALUE PROBLEMS ARISING IN THERMAL CONVECTION” (2002) Annual of Sofia University St. Kliment Ohridski. Faculty of Mathematics and Informatics, 94, pp. 71–83. Available at: https://annual.uni-sofia.bg/index.php/fmi/article/view/191 (Accessed: 14 December 2025).