G. Veis.International Symposium on the Use of Artificial Satellites for Geodesy (1st : 1962 : Washington)：The use of artifical satellites for geodesy; proceedings of the symposium.North-Holland Pub. Co.,1963.
International Symposium on the Use of Artificial Satellites for Geodesy (1st : 1962 : Washington)：The use of artifical satellites for geodesy; proceedings of the symposium
