Secure speech and data communication over the public switching telephone network. - Luís Díez del Río; Sofía Moreno-Pérez; Rafael Sarmiento de Sotomayor; José Parera; Marcelino Veiga-Pérez; Ramón García-Gómez (ICASSP (2), 1994)

Voice processing architecture for computer-telephony integration. - Rafael Ciria; Rafael Sarmiento de Sotomayor; Cristina Aguila; José Parera; Juan Santos (EUROSPEECH, 1995)