1. Bien R., Fricke, W., Lederle, T., and Schwan, H. 1978. Veröff. Astron. Rechen-Institut Heidelberg No. 29.
2. Brosche, P. 1966. Veröff. Astron. Rechen-Institut Heidelberg No. 17.
3. Brown, D. C. 1955. Ballistic Research Laboratories Rept. No. 937. Aberdeen Proving Grounds, Maryland.
4. Corbin, T. 1977. The Proper Motion System of the AGK3R. University Microfilms, Ann Arbor (Dissertation, University of Virginia)
5. Eichhorn, H. 1982. in: Automated Data Retrieval in Astronomy, p. 103. C. Jaschek and W. Heintz (eds.). Dordrecht.