@article{STO_1982_1982_1_a12,
     author = {Sales, Ton},
     title = {Conjuntos difusos como clases de conjuntos.},
     journal = {Stochastica},
     pages = {249-264},
     year = {1982},
     volume = {6},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/STO_1982_1982_1_a12/}
}