NOKEL, M.; LOUKACHEVITCH, N. Topic models: adding bigrams and taking account of the similarity between unigrams and bigrams. Numerical Methods and Programming (Vychislitel’nye Metody i Programmirovanie), [S. l.], v. 16, n. 44, p. 215–234, 2015. DOI: 10.26089/NumMet.v16r222. Disponível em: https://en.num-meth.ru/index.php/journal/article/view/828. Acesso em: 14 dec. 2025.