@article{TUW-224337, author = {Montenbruck, Oliver and Rizos, Chris and Weber, Robert and Neilan, Ruth E. and Hugentobler, Urs}, title = {Getting a Grip on Multi-GNSS -The International GNSS Service MGEX Campaign}, journal = {GPS World}, year = {2013}, volume = {July 2013}, pages = {44--49} }