@inproceedings{TUW-119194, author = {Retscher, G{\"u}nther and Egbonu, Ulrike}, title = {3-D Blade Guidance and Control Systems for Construction Machines}, booktitle = {Geodesy for Geotechnical and Structural Engineering II}, year = {2002}, pages = {539--540}, address = {Berlin}, isbn = {3-9501492-1-x}, note = {talk: Symposium on Geodesy for Geotechnical and Structural Engineering, Berlin; 2002-05-21 -- 2002-05-24} }