1. Comparison of predictions based on observational data with the results of randomized controlled clinical trials of coronary artery bypass surgery
2. Randomized Clinical Trials
3. ‘The necessity and justification of randomized clinical trials’, in and (eds), Controversies in Cancer. Design of Trials and Treatment, Masson Publishing, New York, 1979, pp. 75–82.
4. Why Data Bases Should Not Replace Randomized Clinical Trials
5. ‘Possibilities and limitations of observational studies and evaluation of medical data bases’, in (ed.), Proceedings of the 26th Annual Meeting of the German Society of Medical Documentation, Computer Sciences, and Statistics, Springer-Verlag, New York, 1981, pp. 528–537.