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              Walper, S., Sawatzki, B., Alt, P., Reim, J., Schmiedeberg, C. and Thönnissen, C. (2020) 'The pairfam COVID-19 survey: Design and instruments', Pairfam Technical Paper 15. Preliminary Version.
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              Walper, Sabine, Sawatzki, Barbara, Alt, Philipp, Reim, Julia, Schmiedeberg, Claudia, Thönnissen, Car- olin & Wetzel, Martin (2021). The pairfam COVID-19 survey: Design and instruments: Release 1.1. pairfam Technical Paper Nr. 15. Verfügbar unter:
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              Walper, S., Sawatzki, B., Alt, P., Reim, J., Schmiedeberg, C., Thönnissen, C., Wetzel, M. (2020). The pairfam COVID-19 survey: Design and instruments: Release 1.1. Preliminary Version. Pairfam Technical Paper 15.
                 (xsd:string)
              
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