AHMAD KHAN, Mumtaz; SALAMA ABUKHAMMASH, Ghazi. A study on two variable analogues of certain fractional integral operators. Pro Mathematica, [S. l.], v. 17, n. 33, p. 31–48, 2003. Disponível em: https://revistas.pucp.edu.pe/index.php/promathematica/article/view/8215. Acesso em: 28 dic. 2025.