Jiping Sun Fakhri Karray Otman Basir Mohamed Kamel Natural language understanding through fuzzy logic inference and its application to speech recognition. 1120-1125 2002 FUZZ-IEEE https://doi.org/10.1109/FUZZ.2002.1006661 conf/fuzzIEEE/2002 db/conf/fuzzIEEE/fuzzIEEE2002.html#SunKBK02