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K. P. Strohmeier, V. Kersting, B. Citlak, and J. Amonn, Possibilities of adapting the "Atlas of Child Development" from Canada (B.C.) for Germany. Gütersloh: Bertelsmann Foundation, 2008 [Online]. Available: https://www.klees-net.de/pdf/Auszug_Machbarkeitsstudie-KECK.pdf