| 1998 | Interspeech | Unsupervised training of HMMs with variable number of mixture components per state. | Cesar Martn del Alamo, Luis Villarrubia, Francisco Javier Gonzlez, Luis A. Hernndez Gmez |
| 1997 | ICASSP | Automatic alternative transcription generation and vocabulary selection for flexible word recognizers. | Doroteo T. Toledano, Luis Villarrubia, Luis A. Hernndez Gmez, Jose Maria Elvira |
| 1996 | ICASSP | Context-dependent units for vocabulary-independent Spanish speech recognition. | Luis Villarrubia, Luis A. Hernndez Gmez, Jose Maria Elvira, Juan Carlos Torrecilla |
| 1996 | Interspeech | On-line garbage modeling with discriminant analysis for utterance verification. | F. Javier Caminero-Gil, Celinda de la Torre, Luis Villarrubia, Cesar Martn del Alamo, Lis Hernndez |
| 1995 | Interspeech | Rejection techniques based on context independent subword units. | Juan Carlos Torrecilla, Daniel Tapias Merino, F. Javier Caminero-Gil, Luis Villarrubia |
| 1993 | ICASSP | Rejection techniques for digit recognition in telecommunication applications. | Luis Villarrubia, Alejandro Acero |
| 1991 | Interspeech | An approach to automatic recognition of keywords in unconstrained speech using parametric models. | M. J. Poza, Celinda de la Torre, Daniel Tapias, Luis Villarrubia |
| 1991 | Interspeech | Influence of the telephone line on automatic speech recognition. | Luis Villarrubia, M. J. Poza, Carlos Crespo-Casas |