@article{4227, author = "Simonsen, O. and International Union of Geodesy and Geophysics - XII General Assembly Helsinki 25 July - 6 August 1960", title = "Closing errors for a part of U. E. L. N. comprising E + P (polygons 4001 - 4012 and 9023 - 9024 and parts of polygons 9020 - 9022) calculated by use of both (a) true gravity g at ground surface (b) theoretical standard gravity in zero level ", year = "1960", note = "1 sv., International Association of Geodesy, International Commission for European Levelling", }