The The study of the obstacles and errors in the modern didactics. Particularizations for middle school mathematics: Methodological aspects of empirical research. Studia Doctoralia Psychology and Educational Science, [S. l.], v. 1, n. 1-2, p. 114–129, 2012. DOI: 10.47040/sd/sdpsych.v1i1-2.7. Disponível em: https://journals.unibuc.ro/index.php/sd/article/view/1229. Acesso em: 5 dec. 2025.