MAKLÁRI , József. DIE NEUNPUNKT-KEGELSCHNITTE DES DREIECKS Periodica Polytechnica Electrical Engineering, [S. l.], v. 16, n. 1, p. 59–71, 1972. Disponível em: https://pp.bme.hu/ee/article/view/5028. Acesso em: 13 may. 2024.