@article {10.3262/PAED1903010, 
	author = "Tillmann, Klaus-Jürgen",
	title = "Die Sekundarstufe I",
	journal = "Pädagogik",
	ISSN = "0933-422X",
	year = "2019",
	number = "3",
	pages = "10-15",
	doi = "10.3262/PAED1903010",
	url = "https://content-select.com/index.php?id=bib_view&doi=10.3262%2FPAED1903010",
	publisher = "Beltz Verlagsgruppe",
	language = "",
}