1. Ways4all (2012),
http://www.ways4all.at
(visited January 2012)
2. Kiers, M., Bischof, W., Krajnc, E., Dornhofer, M.: Evaluation and Improvements of an RFID Based Indoor Navigation System for Visually impaired and Blind People. In: 2011 International Conference on Indoor Positioning and Indoor Navigation; Paper, Guimarães, Portugal (September 2011)
3. Lecture Notes in Computer Science;E. Krajnc,2011
4. PAVIP (2012), PAVIP Transport Flyer,
http://www.bones.ch/bones/media/downloads-ger/pavip/Flyer%20PAVIP%20Transport.pdf
(visited January 2012)
5. APEX (2012). System TYFLOSET® – Ein elektronisches Orientierungs- und Informationssystem für Blinde und Sehbehinderte,
http://www.apex-jesenice.cz/tyfloset.php?lang=de
(visited January 2012)