Janusz T. Starczewski A Triangular Type-2 Fuzzy Logic System. 1460-1467 2006 FUZZ-IEEE https://doi.org/10.1109/FUZZY.2006.1681901 conf/fuzzIEEE/2006 db/conf/fuzzIEEE/fuzzIEEE2006.html#Starczewski06