1. Concluding report on the NOBIN-ZIS project 1972–1976 (available from BAZIS, University Hospital Leyden, the Netherlands).
2. Evaluation of the Leyden HIS. Report (in Dutch) to the ministry of education and science made by an independent consultant (Van de Bunt), Staatsuitgeverij’s-Gravenhage, 1979. ( Translation available from BAZIS, University Hospital Leyden, the Netherlands).
3. Bakker, A.R., Implementation approach and evaluation of the use of Leyden University Hospital Information System. Proc. Medinfo 77 Shires, D.H., Wolf, eds. (1977) p. 943
4. Kouwenberg, J.M.L., Bongers, A., Bakker, A.R., Storage structure in a large database. In: Lecture Notes in Medical Informatics. Berlin Proceedings 1979. Ed. B. Barber, F. Grémy, K. Uberla and G. Wagner, 1979, pp. 590–594.