@unpublished{TUW-239904, author = {Sch{\"o}nberger, Caroline and Gnilsen, Paul and B{\"o}hm, Johannes and Haas, R.}, title = {Twin telescopes at Onsala and Wettzell and their contribution to the Very Long Baseline Interferometry Global Observing System}, year = {2015}, note = {talk: IUGG 2015 General Assembly, Prag; 2015-06-22 -- 2015-07-02} }