@inproceedings{TUW-119455, author = {Retscher, G{\"u}nther and Mok, Esmond}, title = {GPS Navigation and Guidance Systems for Construction Industry}, booktitle = {Conference on Advances in Building Technology}, year = {2002}, address = {Vol II}, numpages = {7}, note = {talk: Conference on Advances in Building Technology ABT 2002, Hong Kong; 2002-12-04 -- 2002-12-06} }