Advances in Artificial Intelligence : 19th Conference of the Spanish Association for Artificial Intelligence, CAEPIA 2020/2021, Málaga, Spain, September 22-24, 2021, Proceedings - Alba, Enrique; Camacho, David; Chicano, Francisco; Cotta, Carlos; Gil-Merino, Rodrigo; Luque, Gabriel; Montes, Susana; Ojeda-Aciego, Manuel; Riquelme, José; Troncoso, Alicia (Springer International Publishing, 2021)