@article{4228, 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 CH + D + DK + I + NL and small parts of A and F (polygons 2001 - 2011, 5001 - 5003, 9001 - 9002, 9011, 9012, 9014,and parts of polygons 9003, 9005, 9006, 9007, 9008, 9009, 9010, 9013, 9015 - 9019 and some single lines within I) calculated by the 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", }