PRODINGER, Helmut. Summing a family of generalized Pell numbers. Annales Mathematicae Silesianae, [S. l.], v. 35, n. 1, p. 105–112, 2020. Disponível em: https://journals.us.edu.pl/index.php/AMSIL/article/view/13477. Acesso em: 8 apr. 2025.