Juan R. Castro Oscar Castillo Patricia Melin Luis G. Martínez S. Escobar I. Camacho Building Fuzzy Inference Systems with the Interval Type-2 Fuzzy Logic Toolbox. 53-62 2007 Analysis and Design of Intelligent Systems using Soft Computing Techniques http://dx.doi.org/10.1007/978-3-540-72432-2_7 series/asc/2007-41 db/series/asc/asc41.html#CastroCMMEC07