Interval Type-2 Fuzzy Sets are Generalization of Interval-Valued Fuzzy Sets: Toward a Wider View on Their Relationship.
Humberto Bustince SolaJavier FernándezHani HagrasFrancisco HerreraMiguel PagolaEdurne BarrenecheaPublished in: IEEE Trans. Fuzzy Syst. (2015)