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              Billiet, J. et al. (2007). Estimation of nonresponse bias in the European Social Survey: using information from reluctant respondents. Journal of Official Statistics, 23, 135-162.
                 (xsd:string)
              
            
              Billiet, J., Philippens, M., Fitzgerald, R., & Stoop, I. (2007). Estimation of nonresponse bias in the European Social Survey: Using information from reluctant respondents. Journal of Official Statistics, 23(2), 135-162.
                 (xsd:string)
              
            
              Billiet, J./Philippens, M./Fitzgerald, R. and Stoop, I. (2007): Estimation of nonresponse bias in the European Social Survey: Using information from reluctant respondents. Journal of Official Statistics 23 (2), 135-162.
                 (xsd:string)
              
             | 
      
        | ?:name | 
            
              Billiet, J., ., Stoop, I., Stoop, I. (2007). Estimation of nonresponse bias in the European Social Survey: using information from reluctant respondents. Journal of Official Statistics, 23(2), pp. 135-162.
                 (xsd:string)
              
             |