Charalampous, E., Psimoulis, P., Guillaume, S., Spiridonakos, M., Klis, R., Burki, B., Rothacher, M., Chatzi, E., Luchsinger, R., & Feltrin, G. (2015). Measuring sub-mm structural displacements using QDaedalus: a digital clip-on measuring system developed for total stations. Applied Geomatics, 7(2), https://doi.org/10.1007/s12518-014-0150-z