Ing Ren Tsang Dimas Gabriel Hector N. B. Pinheiro George D. C. Cavalcanti Speaker verification using type-2 Fuzzy Gaussian Mixture Models. 2336-2340 2012 SMC https://doi.org/10.1109/ICSMC.2012.6378090 conf/smc/2012 db/conf/smc/smc2012.html#TsangGPC12