@article{4226, author = "Simonsen, O. and International Union of Geodesy and Geophysics - XII General Assembly Helsinki 25 July - 6 August 1960", title = "Closing errors and .. and .. for single lines connection polygons (else separated) from the countries DK + N + S calculated thus (a) by use of the gravity g at ground surface (b) by use of theoretical standard gravity in zero level ", year = "1960", note = "1 sv., International Association of Geodesy. International Commission for European Levelling, 3 vol. příl. ve spol. obálce", }