1. Badura B. Evaluation und Qualitätsberichterstattung im Gesundheitswesen (Evaluation and performance reporting in the health care system). In: Badura B, Siegrist J, editors. Evaluation im Gesundheitswesen. (Evaluating health care). Weinheim: Juventa, 1999:15–42.
2. Science in practice: can health care reform projects in central and eastern Europe be evaluated systematically;Grielen;Health Policy,2000
3. Alber J. Das Gesundheitswesen in der Bundesrepublik Deutschland (the German health care system). Frankfurt/M: Campus, 1992.
4. Organisation for Economic Co-operation and Development (OECD), editor. Länderberichte. Deutschland (Report about Germany). Paris: OECD-Publications, 1997.
5. Die Zukunft des deutschen Gesundheitswesens (the future of the German health care system);Salfeld,2001