@unpublished{TUW-120042, author = {Kabashi, Ismail and Retscher, G{\"u}nther}, title = {High frequent simultaneous zenith angle observations using video theodolites for deformation monitoring}, year = {2005}, note = {accepted for publication; talk: International Conference ''Dynamic Planet 2005'' (IAG), Cairns, Australia; 2005-08-22 -- 2005-08-26} }