E-Tracer: A Smart, Personalized and Immersive Digital Tourist Software System. - Alexandros Kokkalas; Athanasios T. Patenidis; Evangelos A. Stathopoulos; Eirini E. Mitsopoulou; Sotiris Diplaris; Konstadinos Papadopoulos; Stefanos Vrochidis; Konstantinos Votis; Dimitrios Tzovaras; Ioannis Kompatsiaris (iiWAS, 2022)