Advances in Physical Agents Proceedings of the 19th International Workshop of Physical Agents (WAF 2018), November 22-23, 2018, Madrid, Spain - Fuentetaja Pizán, Raquel; Fuentetaja Pizán, Raquel; García Olaya, Ángel; García Olaya, Ángel; Sesmero Lorente, Maria Paz; Sesmero Lorente, Maria Paz; Iglesias Martínez, Jose Antonio; Iglesias Martínez, Jose Antonio; Ledezma Espino, Agapito; Ledezma Espino, Agapito (Springer International Publishing : Imprint: Springer, 2019)