ŽOLDOŠOVÁ, K.; MATEJOVIČOVÁ, I. Finding out how the elementary school children manipulate with empirical material and how they process the obtained information. International Electronic Journal of Elementary Education, [S. l.], v. 2, n. 3, p. 327–348, 2017. Disponível em: https://www.iejee.com/index.php/IEJEE/article/view/243. Acesso em: 12 apr. 2024.