1. Breedveld, F.C., De Vries, R.R.P. Possibilities for the immunotherapy of rheumatoid arthritis. Clin Rheumatol 1990, 9, 2, 171–175.
2. Brückle, W. Neue Trends in der Basistherapie der chronischen Polyarthritis. Z Allg Med 1989, 65, 847–852.
3. Egg, D., Günther, R., Fuchs, D., Hausen, A., Reibnegger, G., Wachter, H. Neopterin, an indicator for activation of cellular immunity, in rheumatoid arthritis. In: Biochemical and Clinical Aspects of Pteridines. Eds.: Pfleiderer, W., Wachter, H., Curtius, H.C. Berlin-New York: Walter de Gruyter 1984, 3, 491–502.
4. Hannonen, P., Tikanoja, S., Hakola, M., Möttönen, T., Viinikka, L., Oka, M. Urinary neopterin index as a measure of rheumatoid activity. Scand J Rheumatol 1986, 15, 148–152.
5. Hausen, A., Fuchs, D., Reibnegger, G., Wachter, H. Neopterin as index for activity of disease in patients with rheumatoid arthritis. In: Biochemical and Clinical Aspects of Pteridins 2, Eds.: Verlag Walter de Gruyter & Co, 1983, 245–254.