Ahmad Khan, Mumtaz, y Ghazi Salama Abukhammash. «A Study on Two Variable Analogues of Certain Fractional Integral Operators». Pro Mathematica 17, no. 33 (febrero 12, 2003): 31–48. Accedido diciembre 26, 2025. https://revistas.pucp.edu.pe/index.php/promathematica/article/view/8215.