BONDARENKO, I.; GRIGRCHUK, R.; KRAVCHENKO, R.; MUNTYAN, Y.; NEKRASCHEVYCH, V.; SAVCHUK, D.; SUNIÉ, Z. Groups generated by 3-state automata over a 2-letter alphabet, I. São Paulo Journal of Mathematical Sciences, [S. l.], v. 1, n. 1, p. 1-39, 2007. DOI: 10.11606/issn.2316-9028.v1i1p1-39. Disponível em: https://www.revistas.usp.br/spjournal/article/view/1. Acesso em: 20 mar. 2023.