P. Fernández Sánchez and R. Rabanal, “Reduccion del grado en aplicaciones de Keller”, ProMath, vol. 28, no. 55, pp. 41–56, Dec. 2014, Accessed: Oct. 10, 2026. Available: https://revistas.pucp.edu.pe/index.php/promathematica/article/view/11047