1. Welsch W. Gegenwartiger Stand der Geodatischen Analyse und Interpretation Geometrischer Deformation. AVN 2, pp. 41-51, 1981.;
2. Chrzanowski A. (with contributions -by the members of the FIG "ad hoc" committee). A comparison of different approaches into the analysis of deformation measurements. Proceedings of FIG XVI International Congress, Montreux, Paper No. 602.3, August 9-18, 1981.;
3. Lazzarini T. Determination of displacements and deformation of structures and their environment by geodetic means, In:unpublished lecture notes, "Engineering Surveys", Ed. A. Chrzanowski, Dept. of Surveying Engineering, University of New Brunswick, Fredericton, N.B., Canada, 1977.;
4. Polak, M. Examination of the stability of reference points in distance and combined angle-distance networks. Proceedings of the 2nd International Symposium on Deformation Measurements by Geodetic methods, Bonn, West Germany, September 25-28, Konrad Wittwer, Stuttgart, 1978.;
5. Pelzer H. Neuere Ergebnisse bei der statistischen Analyse von De formationsmessungen. Proceedings of 14th FIG Congress,Washington, D.C., Paper 608-3, 1974.;