VYTHYNATHASWAMY, R. Parallel Straight Lines. The Journal of the Indian Mathematical Society, [S. l.], v. 6, n. 2, p. 58–61, 1914. DOI: 10.18311/jims/1914/17703. Disponível em: http://informaticsjournals.com/index.php/jims/article/view/17703. Acesso em: 30 apr. 2024.