@article{MSC_1999_1999_1_a20,
     author = {Sobrino, Alejandro},
     title = {Verdad y utilidad en l\'ogica difusa.},
     journal = {Mathware & soft computing},
     pages = {189-199},
     publisher = {mathdoc},
     volume = {6},
     number = {2-3},
     year = {1999},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MSC_1999_1999_1_a20/}
}