1. Vogten AJM. Medical information — online. A critical review on computer access to medical information. Neth J Med 1988;32:34–49.
2. Kleijnen J, Knipschild P, Ter Riet G. Clinical trials of homoeopathy. BMJ 1991;302:316–23.
3. Kleijnen J, Ter Riet G, Knipschild P. Vitamine C en verkoudheid. Overzicht van een megadosis literatuur [Vitamin C and the common cold. Review of a megadosis literature]. Ned Tijdschr Geneeskd 1989;133:1532–5.
4. Kleijnen J, Knipschild P. Ginkgo biloba for intermittent claudication and cerebral insufficiency. In: Kleijnen J. Food supplements and their efficacy [dissertation]. Maastricht: University of Limburg, 1991.
5. Dickersin K, Hewitt P, Mutch L, Chalmers I, Chalmers TC. Perusing the literature: comparison of Medline searching with a perinatal trials database. Controlled Clin Trials 1985;6:306–17.