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63by Seppo Laaksonen, Teemu Kemppainen, Matti Kortteinen, Mats Stjernberg, Mari Vaattovaara, Henrik Lönnqvist“...Survey Research Methods...”
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66by Phillip S. Kott, Patricia M. Guenther, David A. Wagstaff, WenYen Juan, Sibylle Kranz“...Survey Research Methods...”
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