@article{brügelmann_2015,  title={Unterricht muss offener geplant, die Offenheit aber auch klar strukturiert werden},  volume={40},  ISSN={2175-6236},  url={https://doi.org/10.1590/2175-623654414},  DOI={10.1590/2175-623654414},  number={2},  journal={Educação & Realidade},  publisher={Universidade Federal do Rio Grande do Sul - Faculdade de Educação},  author={Brügelmann, Hans},  year={2015},  month={Apr},  pages={349–374} }