For more than 25 years, research carried out was the fruit of work done as a team in conjunction with the French mathematician Arnold Kaufmann. His death in June of 1994, sadly ended this co-operation. All books published in that period are signed by both professors.

• "Introducción de la teoría de los subconjuntos borrosos a la gestión de las empresas" [Introduction of the theory of fuzzy sub-sets to business managment] Published by Milladoiro. Santiago de Compostela (Spain), 1986. (ISBN 84-398-7630-0)
• "Técnicas operativas de gestión para el tratamiento de la incertidumbre" [Management operating techniques for treating uncertainty] Published by Hispano Europea. Barcelona (Spain), 1987.
• "Models per a la recerca d'efectes oblidats" [Models for research into forgotten effects]. Published by Milladoiro, Santiago de Compostela (Spain), 1988. (ISBN 84-404-3657-2)
• "Las matemáticas del azar y de la incertidumbre" [Mathematics of probability and uncertainty]. Published by Centro de Estudios Ramón Areces, Madrid (Spain), 1990. (ISBN 84-871-9126-6)
• "Inversiones. Certeza, riesgo e incertidumbre. I" [Investments. Certainty, risk and uncertainty. I]. Faculty of Economic Sciences. Barcelona (Spain), 1991.
• "Nuevas Técnicas para la dirección estratégica" [New techniques for strategic management]. Published by the University of Barcelona, Barcelona (Spain), 1991. (ISBN 84-475-0215-5)
• "Técnicas de Gestion de Empresas. Previsiones, decisiones y estratégias" [Techniques for Business Management. Estimates, decisions and strategies]. Published by Pirámide. Madrid (Spain), 1992.
• "Técnicas especiales para la gestión de expertos". [Special techniques for managing experts]. Published by Milladoiro, Santiago de Compostela (Spain), 1993. (ISBN 84-404-3657-2)
• "La creatividad en la gestión de las empresas". [Creativity in business management]. In conjunction with A.M. Gil Lafuente. Published by Pirámide, Madrid (Spain), 1994.
• "Matemática para la economía y la gestión de empresas. Vol I (Aritmética de la incertidumbre)". [Mathematics for economy and business management. Vol I. (Arithmetic of uncertainty). In conjunction with A. Terceño. Published by Foro Científico, Barcelona (Spain), 1994.
• "Grafos neuronales para la economía y la gestión de empresas". [Neural graphs for economy and business management]. Published by Pirámide, Madrid (spain), 1995.
• "La gestión interactiva de los recursos humanos en la incertidumbre". [Interactive management of human resources in uncertainty]. Published by CEURA, Madrid, 1996. (English version Kluwer Academic Publishers, 1998)
• "Invertir en la incertidumbre". [Investment in uncertainty]. Published by Pirámide. Madrid, 1997. (English version Kluwer Academic Publishers, 1998).
• “Elementos para una teoría de la decisión en la incertidumbre” [Elements for a theory of decision in uncertainty]. Publ. Milladoiro, Vigo 1999. (ISBN 84-605-9437-8). (English version Kluwer Academic Publishers 1999).
• “Introducción de la teoría de la incertidumbre en la gestión de empresas” [Introduction to the uncertainty theory in enterprises management]. Ed. Milladoiro-Academy of Doctors. Vigo-Barcelona (Spain) 2002. (ISBN 84-931229-4-7). (English version Ed. Springer 2003).
• Algoritmos para el tratamiento de fenómenos económicos complejos. Bases, desarrollos y aplicaciones. [Algorithms for the treatment of complex economic phenomena. Bases, development and applicayions] Publ Universitaria Ramón Areces. Madrid 2007 (ISBN 13-978-84-8004-784-6). In colaboration with Ana María Gil Lafuente.