Khan, M.A. and Salama Abukhammash, G. (2002) “On a generalization of Appell*s functions of two variables”, Pro Mathematica, 16(31-32), pp. 61–83. Available at: https://revistas.pucp.edu.pe/index.php/promathematica/article/view/8183 (Accessed: 10 October 2026).