KUSSAU, Jürgen; OERTEL, Lutz. Educational expansion, restructuring of the lower secondary school level and educational planning offices. Swiss Journal of Educational Research, Bern, v. 23, n. 1, p. 137–164, 2001. DOI: 10.24452/sjer.23.1.4600. Disponível em: https://sjer.ch/article/view/4600. Acesso em: 14 mar. 2025.