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Analyses of mixed survey mode effects in the German nationa..:

Gruschwitz, Dana ; Eggs, Johannes ; Nobis, Claudia.
https://elib.dlr.de/125387/1/pdf_md5%3D753e4a0e62a72488881de14390c97294%26pid%3D1-s2.0-S2352146518302163-main.pdf.  , 2018