1. Bysted Hovedkvateret A/S, 2000. Report: Spørgeskemaundersøgelse 1999 (Questionnaire Survey 1999, in Danish). Bysted Hovedkvateret A/S, Copenhagen.
2. Regression analyses of count data;Cameron,1998
3. Intervention research in occupational health and safety;Goldenhar;Journal of occupational Medicine,1994
4. Do we really know how well our occupational accident prevention programs work?;Guastello;Safety Science,1993
5. Prevention of Accidents Through Experience Feedback;Kjellen,2000