1. Arenas Parra, M.; Bilbao Terol, A.; Jiménez, M.; Rodrí guez Uría M.V., “A Fuzzy Approach to a Fuzzy Linear Goal Programming Problem”. Lectures Notes in Economics and Mathematical Systems 448: Multiple Criteria Decision Making, pp: 255–264. Springer, 1997.
2. Heilpern, S. (1992): “The expected value of a fuzzy number”, Fuzzy Sets and Systems 47 81–86.
3. Ignizio, J.P.(1976): Goal Programming and Extensions, Lexington Books.
4. Jiménez M. (1994): Modelos matemáticos aplicados a la toma de decisiones financieras en condiciones de incertidumbre. Tesis Doctoral, Universidad del País Vasco, Bilbao.