@Book{dubois1993,
  Title                    = {Readings in Fuzzy Sets for Intelligent Systems},
  Author                   = {D. Dubois and R. R. Yager and H. Prade},
  Publisher                = {Morgan Kaufmann},
  Year                     = {1993},

  Address                  = {San Mateo, CA},

  Claves                   = {,l-dif,}
}