@unpublished{TUW-120833, author = {Opitz, Michael and Weber, Robert and Caissey, and Br{\"o}derbauer, Veronika}, title = {Real Time GPS- Satellite- and Receiver Clock Estimation - An interactive RTIGS Web Service}, year = {2007}, note = {talk: EGU 2007, Wien; 2007-04-15 -- 2007-04-20} }