NGUYEN, N.-G. . Integrated Teaching of Extreme Geometric Problems in Vietnam . International Journal of Learning, Teaching and Educational Research, [S. l.], v. 18, n. 8, p. 168–191, 2019. Disponível em: http://www.ijlter.myres.net/index.php/ijlter/article/view/528. Acesso em: 17 apr. 2026.