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              Gummer, T. et al. (2020). The impact of COVID-19 on field- work efforts and planning in pairfam and FReDA-GGS. Survey Research Methods, 14, 223-227.
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              Gummer, T. et al. (2020). The impact of Covid-19 on fieldwork efforts and planning in pairfam and FReDA-GGS. Survey Research Methods, 14, 223-227.
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              Gummer, T. et al. The impact of Covid-19 on fieldwork efforts and planning in pairfam and FReDA-GGS. Surv. Res. Methods 14, 223-227 (2020).
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              Gummer, T., C. Schmiedeberg, M. Bujard, P. Christmann, K. Hank, T. Kunz, D. Lück & F.J. Neyer, 2020: The impact of Covid-19 on fieldwork efforts and planning in pairfam and FReDA-GGS. Survey Research Methods 14: 223-227.
                 (xsd:string)
              
            
 
            - 
              Gummer, T., C. Schmiedeberg, M. Bujard, P. Christmann, K. Hank, T. Kunz, D. Lück, and F. J. Neyer. 2020. "The Impact of Covid-19 on Fieldwork Efforts and Planning in Pairfam and FReDA-GGS." Survey Research Methods 14(2):223-
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            - 
              Gummer, T., Schmiedeberg, C., Bujard, M., Christmann, P., Hank, K., Kunz, T. et al. (2020) The impact of Covid-19 on fieldwork efforts and planning in pairfam and FReDA-GGS. Survey Research Methods, 14(2), 223-227.
                 (xsd:string)
              
            
 
            - 
              Gummer, T., Schmiedeberg, C., Bujard, M., Christmann, P., Hank, K., Kunz, T., Lück, D., & Neyer, F. J. (2020). The impact of Covid-19 on fieldwork efforts and planning in pairfam and FReDA- GGS. Survey Research Methods, 14(2), 223-227.
                 (xsd:string)
              
            
 
            - 
              Gummer, T., Schmiedeberg, C., Bujard, M., Christmann, P., Hank, K., Kunz, T., Lück, D., & Neyer, F. J. (2020). The impact of Covid-19 on fieldwork efforts and planning in pairfam and FReDA-GGS. Survey Research Methods, 14(2), 223-227. https://doi.org/10.18148/srm/2020.v14i2.7740
                 (xsd:string)
              
            
 
            - 
              Gummer, T., Schmiedeberg, C., Bujard, M., Christmann, P., Hank, K., Kunz, T., Lück, D., & Neyer, F.J. (2020). The impact of COVID-19 on fieldwork efforts and planning in pairfam, GGS, and FReDA in Germany. Survey Research Methods, 14, 2, 223-227. https://doi.org/10.18148/srm/2020.v14i2.7740
                 (xsd:string)
              
            
 
            - 
              Gummer, T., Schmiedeberg, C., Bujard, M., Christmann, P., Hank, K., Kunz, T., Lück, D., and Neyer, F.J. (2020). The impact of COVID-19 on fieldwork efforts and planning in pairfam and FReDA-GGS. Survey, Research, Methods 14(2): 223- 227. doi:10.18148/srm/2020.v14i2.7740.
                 (xsd:string)
              
            
 
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              Gummer, Tobias et al. 2020: The impact of Covid-19 on fi eldwork efforts and planning in pairfam and FReDA-GGS. In: Survey Research Methods 14,2: 223-227. https://doi.org/10.18148/srm/2020.v14i2.7740
                 (xsd:string)
              
            
 
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              Gummer, Tobias et al. 2020: The impact of Covid-19 on  eldwork efforts and planning in pairfam and FReDA-GGS. In: Survey Research Methods 14,2: 223-227. https://doi.org/10.18148/srm/2020.v14i2.7740
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