Lip-shape Dependent Face Verification. - Josef Kittler; Yongping Li; Jiri Matas; M. Ulises Ramos Sánchez (AVBPA, 1997)

Combining Evidence in Multimodal Personal Identity Recognition Systems. - Josef Kittler; Yongping Li; Jiri Matas; M. Ulises Ramos Sánchez (AVBPA, 1997)

Statistical Chromaticity Models for Lip Tracking with B-splines. - M. Ulises Ramos Sánchez; Jiri Matas; Josef Kittler (AVBPA, 1997)

Statistical chromaticity-based lip tracking with B-splines. - M. Ulises Ramos Sánchez; Jiri Matas; Josef Kittler (ICASSP, 1997)

Combining evidence in personal identity verification systems. - Josef Kittler; Jiri Matas; Kenneth Jonsson; M. Ulises Ramos Sánchez (Pattern Recognit. Lett., 1997)

Fusion of Talking Face Biometric Modalities for Personal Identity Verification. - M. Ulises Ramos Sánchez; Josef Kittler (ICASSP (5), 2006)