@inproceedings{echtler2009ledflash, author = {Echtler, F. and Sielhorst, T. and Huber, M. and Klinker, G.}, title = {A Short Guide to Modulated Light}, booktitle = {TEI '09: Proceedings of the conference on tangible and embedded interaction}, month = feb, year = 2009, keywords = {multi-touch, infrared, sensing} }