@unpublished{TUW-167815, author = {Schuh, Harald and Rothacher, Markus and Neilan, Ruth E. and Plag, H.-P.}, title = {IAG's Global Geodetic Observing System (GGOS) and its Relation to IAG Commission 3.}, year = {2008}, note = {poster presentation: ETS2008, Jena; 2008-09-05} }