The effects of voice disguise upon formant transition. - Lü Shinan; A. Almeida (ICASSP, 1986)

LEM3 Algorithm Generalization Based on Stochastic Approximation Space. - María C. Fernández-Baizán; C. Pérez-Llera; J. Feito-García; A. Almeida (Rough Sets and Current Trends in Computing, 2000)