KHAN, Mumtaz Ahmad. On fractional integral operators of three variables and integral transforms. Pro Mathematica, [S. l.], v. 25, n. 49, p. 5184, 2011. Disponível em: https://revistas.pucp.edu.pe/index.php/promathematica/article/view/2657. Acesso em: 16 dic. 2025.