Machine Learning applied to Wi-Fi fingerprinting: The experiences of the Ubiqum Challenge. - Jordi Rojo; Carmen Corvalán; Florian Unger; Sara Marín López; Ignacio Soteras; Daniel Castejón Bravo; Joaquín Torres-Sospedra; Germán Martín Mendoza-Silva; Gabriel Ristow Cidral; Jorma Laiapea; Gerardo Parrello; Arnau Simó; et al. (IPIN, 2019)