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              Dülmer, H. (2007). Experimental Plans in Factorial Surveys: Random or Quota Design? Sociological Methods & Research, 35(3), 382-409.
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              Dülmer, H. (2007). Experimental Plans in Factorial Surveys: Random or Quota Design? Sociological Methods & Research, 35(3), 382-409. https://doi.org/10.1177/0049124106292367
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              Dülmer, H. (2007). Experimental plans in factorial surveys: Random or quota Design? Sociological Methods & Research, 35, S. 382-409.
                 (xsd:string)
              
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