BRUNNER, Esther; GASTEIGER, Hedwig; LAMPART, Jonas; SCHREIEDER, Kathrin. Mathematics in age-mixed classes in Swiss and in German primary schools: a comparative study. Swiss Journal of Educational Research, Bern, v. 41, n. 1, p. 160–176, 2019. DOI: 10.24452/sjer.41.1.11. Disponível em: https://sjer.ch/article/view/5447. Acesso em: 3 apr. 2025.