KROLL, Wolfgang. Kegelschnitte — eine Neubesinnung. mathematica didactica , [S. l.], v. 28, n. 1, p. 79–97, 2005. DOI: 10.18716/ojs/md/2005.1051. Disponível em: https://journals.ub.uni-koeln.de/index.php/mathematica_didactica/article/view/1051. Acesso em: 19 mai. 2024.