Scaffolding in Indoor and Outdoor Mobility: A wearable and mobile application for Senior Tourism in a Playable City. - Costa, Liliana Vale; Arnab, Sylvester; Tomlins, Richard; Veloso, Ana Isabel; Loizou, Michael; Sukumar, Arun (CISTI (Iberian Conference on Information Systems & Technologies / Conferência Ibérica de Sistemas e Tecnologias de Informação) Proceedings, 2019)