Universal real–time navigational assistance (URNA): an urban Bluetooth beacon for the blind, In: Proceedings of the 1st ACM SIGMOBILE international workshop on systems and networking support for healthcare and assisted living environments, pp 83–88

Bohonos S, Lee A, Malik A, Thai C, Manduchi R (2007) Universal real–time navigational assistance (URNA): an urban Bluetooth beacon for the blind, In: Proceedings of the 1st ACM SIGMOBILE international workshop on systems and networking support for healthcare and assisted living environments, pp 83–88

2007