DENG, L. Hierarchical nonstationarity in a class of doubly stochastic models with application to automatic speech recognition. Canadian Acoustics, [S. l.], v. 19, n. 4, p. 113–114, 1991. Disponível em: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/695. Acesso em: 20 feb. 2025.