1. Den landsdækkende sundhedstjeneste i slagtesvinebesætningerne;Andersen;Dansk Vet. Tidsskr.,1980
2. Statistical Models Based on Counting Processes;Andersen,1993
3. The Analysis of Case-Control Studies,1980
4. The Design and Analysis of Cohort Studies,1987
5. Validity of producer-recorded causes of preweaning mortaility in the Danish health and production surveillance system;Christensen,1992