- Author: José Hernández Orallo, César Ferri Ramírez, María José Ramírez Quintana
- Language: Spanish
- Year: 2004
- Author: José Hernández-Orallo
- Language: English
- Year: 2017
- Author: José Hernández-Orallo
- Language: english
- Year: 2017
- Author: José Hernández-Orallo
- Language: English
- Year: 2017