RASSIAS, John Michael. On approximation of approximately quadratic mappings by quadratic mappings. Annales Mathematicae Silesianae, [S. l.], v. 15, p. 67–78, 2001. Disponível em: https://journals.us.edu.pl/index.php/AMSIL/article/view/14116. Acesso em: 25 dec. 2025.