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              Rässler, S., Koller, F. and Mäenpää, C. (2002). A split ques- tionnaire survey design applied to German media and consumer sur- veys. In Friedrich-Alexander University Erlangen-Nuremberg, Chair of Statistics and Econometrics Discussion Papers [online], available at https://www.statistik.rw.fau.de/files/2016/03/d0042b.pdf.
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              Rässler, S., Koller, F., Mäenpää, C. (2002), A Split Questionnaire Survey Design applied to German Media and Consumer Surveys, Proceedings of the International Conference on Improving Surveys, ICIS 2002, Copenhagen.
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              Rässler, S., Koller, F., Mäenpää, C. (2002). A Split Questionnaire Design applied to German Media and Consumer Surveys. Proceedings of the Interna- tional Conference on Improving Surveys, ICIS 2002, Copenhagen.
                 (xsd:string)
              
            
              R€ assler, S., F. Koller, and C. M€ aenp€ a€ a (2002), "A Split Questionnaire Survey Design Applied to German Media and Consumer Surveys," in Friedrich-Alexander University Erlangen- Nuremberg, Chair of Statistics and Econometrics Discussion Papers [online], available at https://www.statistik.rw.fau.de/files/2016/03/d0042b.pdf.
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              Rässler, S., Koller, F., Mäenpää, C. (2002). A split ques- tionnaire survey design applied to German media and consumer sur- veys. Copenhagen: Friedrich-Alexander University Erlangen- Nuremberg, Chair of Statistics and Econometrics Discussion Papers [online.
                 (xsd:string)
              
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