ERDOĞAN, H. Î. A QUASI-GROUP ASSOCIATED WITH THE WEB FORMED BY THREE PENCILS OF CIRCLES WHICH BELONG TO THE SAME BUNDLE. Periodica Polytechnica Transportation Engineering, [S. l.], v. 19, n. 1-2, p. 37–40, 1991. Disponível em: https://pp.bme.hu/tr/article/view/6680. Acesso em: 4 may. 2024.