Publication / International Association of Geodesy, Section 1 - Positioning, Subcommission for the European Reference Frame (EUREF). Report on the symposium of the IAG Subcommission for the European Reference Frame (EUREF). - 1993. Verl. d. Bay. Akad. d. Wiss. München 1993Astronomisch-Geodätische Arbeiten: 53. ISBN 3-7696-9796-0