CHMIELIŃSKI, Jacek. On the superstability of the generalized orthogonality equation in Euclidean spaces. Annales Mathematicae Silesianae, [S. l.], v. 8, p. 127–140, 1994. Disponível em: https://journals.us.edu.pl/index.php/AMSIL/article/view/14224. Acesso em: 15 apr. 2025.