JAKUBEC, Stanislav; LAŠŠÁK, Miroslav. Congruence of Ankeny-Artin-Chowla type modulo p^2. Annales Mathematicae Silesianae, [S. l.], v. 12, p. 75–91, 1998. Disponível em: https://journals.us.edu.pl/index.php/AMSIL/article/view/14165. Acesso em: 12 apr. 2025.