1. Apice System. (n.d.). Tiles for the visually impaired. Retrieved from
http://www.s-tiles.org/s-tiles/articoli.nsf/VSNW04E/B5937E10AFED7A80C1256F0E002DAC4C
2. Biader Ceipidor U., Medaglia C. M., Rizzo F., & Serbanati A. (2006). RadioVirgilio/Sesamonet: an RFID-based Navigation system for visually impaired.
3. BlindSquadre Website. (n.d.). Retrieved from
http://www.blindsquare.com/about
4. Braille to Note GPS Website. (n.d.). Retrieved from
https://store.humanware.com/hus/braillenote-gps-software-and-receiver-package.html
5. Brilhault A., Kammoun S., Gutierrez O., Truillet P., & Jouffrais C. (2011). Fusion of artificial vision and GPS to improve blind pedestrian positioning. Proceedings of the 4th IFIP International Conference on New Technologies, Mobility and Security (NTMS), Paris.