ERNVALL, R. On the distribution mod 8 of the E-irregular primes. Annales Fennici Mathematici, [S. l.], v. 1, n. 1, p. 195–198, 1975. DOI: 10.5186/aasfm.1975.0102. Disponível em: https://afm.journal.fi/article/view/134253. Acesso em: 26 apr. 2025.