A Proposal of Payment System for Public Transport based on Ubiquitous Paradigm. - Carmelo R. García; Ricardo Pérez 001; Joaquín Caraballo; Francisco Alayón Hernández; Gabino Padrón (ICUC, 2006)

PSPRT: A Case of Pervasive System for Public Road Transport. - Carmelo R. García; Francisco Alayón Hernández; Joaquín Caraballo; Ricardo Pérez 001; Gabino Padrón (EUROCAST, 2007)