How many movies have Fernando de la Riva and José Luis Pérez Tristán collaborated on?

They have worked on 4 movies together! Their first movie together was Sor Citroen (1967) while their highest rated movie together was ¡Cómo sois las mujeres! (1968). They have not worked together since ¡No firmes más letras, cielo! (1972). They are most known for their comedy films together.