Facilitating the Child-Robot Interaction by Endowing the Robot with the Capability of Understanding the Child Engagement: The Case of Mio Amico Robot. - Chiara Filippini; Edoardo Spadolini; Daniela Cardone; Domenico Bianchi; Maurizio Preziuso; Christian Sciarretta; Valentina del Cimmuto; Davide Lisciani; Arcangelo Merla (Int. J. Soc. Robotics, 2021)