1. Swiss Institute for Information Research, University of Applied Sciences of the Grisons, Pulvermühlestrasse 57, 7000 Chur, Switzerland
2. webLyzard technology, Liechtensteinstrasse 41/26, 1090 Vienna, Austria
3. Research Center of New Media Technology, Modul University Vienna, Am Kahlenberg 1, 1190 Vienna, Austria
4. Modul Technology, Am Kahlenberg 1, 1190 Vienna, Austria