HOA, T. A.; DUONG, T. M. Developing Learners’ Mathematical Problem-Solving Competence in Teaching Visual Geometry to Grade 7 Students Using the Dynamic Geometry Software GeoGebra. Vietnam Journal of Education, [S. l.], v. 10, n. 2, p. 138–149, 2026. DOI: 10.52296/vje.2026.893. Disponível em: https://jcepp.org/index.php/journal/article/view/893. Acesso em: 25 jun. 2026.