OSWALD. Über ähnliche Aufsatzdreiecke einer Strecke. Teaching Mathematics and Computer Science, [S. l.], v. 5, n. 2, p. 337–348, 2007. DOI: 10.5485/TMCS.2007.0162. Disponível em: https://ojs.lib.unideb.hu/tmcs/article/view/14802. Acesso em: 20 oct. 2024.