Humberto Bustince Sola Miguel Pagola Pedro Melo-Pinto Edurne Barrenechea Tartas Pedro Couto Image Threshold Computation by Modelizing Knowledge/Unknowledge by Means of Atanassov's Intuitionistic Fuzzy Sets. 621-638 2008 Fuzzy Sets and Their Extensions: Representation, Aggregation and Models http://dx.doi.org/10.1007/978-3-540-73723-0_32 series/sfsc/2008-220 db/series/sfsc/sfsc220.html#SolaPMTC08