Vicenç Torra; Daniel Abril; Guillermo Navarro-Arribas "Fuzzy methods for database protection", 7th conference of the European Society for Fuzzy Logic and Technology (EUSFLAT-2011) and LFA-2011. Advances in Intelligent Systems Research, vol. 1-1, Aix-les-Bains, France, Atlantis Press, pp. 439 - 443, 18/07/2011. Abstract