AIxIA 2021 - Advances in Artificial Intelligence : 20th International Conference of the Italian Association for Artificial Intelligence, Virtual Event, December 1-3, 2021, Revised Selected Papers - Bandini, Stefania; Gasparini, Francesca; Mascardi, Viviana; Palmonari, Matteo; Vizzari, Giuseppe (Cham Springer International Publishing AG, 2022)