Timmen, Ludger: Absolute gravity measurements at the iGrav047 site on Helgoland (GFZ Potsdam, AWI facility) with the Hannover gravity meter FG5X-220 in July 2020. Working Paper. Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2020-07-10, 2 S. DOI:
https://doi.org/10.15488/13077