Accessibility Services and Interactive Digital Television: An Opportunity to Reduce the Digital Gap. - Ángel García-Crespo; Belén Ruíz-Mezcua; Israel González-Carrasco; José Luis López Cuadrado; Zenith Hernandez; Raul Barahona; Lydia Holnes de Toppin (Rev. Iberoam. de Tecnol. del Aprendiz., 2014)