@inproceedings{TUW-120545, author = {Heinkelmann, Robert and B{\"o}hm, Johannes and Schuh, Harald}, title = {Combination of Long-term Time Series of Tropospheric Parameters Observed by VLBI}, booktitle = {Proceedings IVS General Meeting}, year = {2006}, pages = {341--343}, publisher = {Proceedings of IVS General Meeting}, address = {Conception, Chile, January 9-11} }