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: https://ijlter.net/index.php/ijlter/article/view/528. Acesso em: 24 aug. 2026.