Alvarado, M., Jesús Fernando Novoa Ramírez, and L. Rodríguez. “UNA NOTA SOBRE EL ESPACIO NULA”. Universitas Scientiarum 8 (July 10, 2003): 7–12. Accessed June 1, 2025. https://ojspuj.repositoriodigital.com/index.php/scientarium/article/view/4850.