@unpublished{TUW-119284, author = {Schuh, Harald and B{\"o}hm, Johannes and Hobiger, Thomas and Weber, Robert}, title = {Comparison and combination of ionospheric and tropospheric Parameters in VLBI and GPS}, year = {2002}, note = {talk: EGS XXVII General Assembly, Nice, France, Nizza; 2002-04-26} }