@article {10.3262/UW1404321, 
	author = "Ehmke, Timo AND van den Ham, Ann-Katrin AND Roppelt, Alexander AND Nissen, Annika AND Sälzer, Christine",
	title = "Mathematische Kompetenz in PISA, IQB-Ländervergleich und NEPS - Drei Studien, gleiches Konstrukt? ",
	journal = "Unterrichtswissenschaft",
	ISSN = "0340-4099",
	year = "2014",
	number = "4",
	pages = "321-342",
	doi = "10.3262/UW1404321",
	url = "https://content-select.com/index.php?id=bib_view&doi=10.3262%2FUW1404321",
	publisher = "Beltz Juventa",
	language = "",
}