@article{MSC_1999_1999_1_a19,
     author = {Trillas, Enric and Alsina, Claudi},
     title = {Una reflexi\'on sobre qu\'e es una funci\'on de pertenencia.},
     journal = {Mathware & soft computing},
     pages = {201-215},
     publisher = {mathdoc},
     volume = {6},
     number = {2-3},
     year = {1999},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MSC_1999_1999_1_a19/}
}