1. AARDOOM, L., A.G. GIRNIUS and G. VEIS (1967). Determination of the absolute space directions between Baker-Nunn camera stations. Proc. 2nd International Symposium on the Use of Artificial Satellites for Geodesy, Ed. G. Veis, IAG and COSPAR, Athens, Greece, April, 1965. National Technical University, Vol. II, pp. 315–344.
2. Gesetzmässigkeiten der absoluten Lagegenauigkeit von Blöcken;ACKERMANN;Bildmessung und Luftbildwesen,1968
3. ACKERMANN, F. (1974). Results of recent experimental investigations in aerial triangulation. Proc. 40th Annual Meeting of the American Society of Photogrammetry, St. Louis, U.S.A., March, pp. 216–234.
4. ADAMS, G.W. (1977). Inertial survey data reduction using maximum likelihood estimation. Proc. 1st International Symposium on Inertial Technology for Surveying and Geodesy, IAG and CIS, Ottawa, Canada, October. Canadian Institute of Surveying, pp. 380–387.
5. Aspects of large leveling nets;ALBERDA;Canad. Surv.,1974