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