KHAN, Mumtaz Ahmad; SALAMA ABUKHAMMASH, Ghazi. On certain fractional integral operators of two variables and integral transforms. Pro Mathematica, [S. l.], v. 17, n. 34, p. 169–193, 2003. Disponível em: https://revistas.pucp.edu.pe/index.php/promathematica/article/view/10209. Acesso em: 16 dic. 2025.