1. Agarwal, R., et al.: “Low cost ultrasonic smart glasses for blind,” 2017 8th IEEE Annual Information Technology, Electronics and Mobile Communication Conference (IEMCON), Vancouver, pp. 210–213, IEEE (2017)
2. Balachandran, W., Cecelja, F., Ptasinski, P.: “A GPS based navigation aid for the blind,” 17th International Conference on Applied Electromagnetics and Communications, pp. 34–36, IEEE (2013)
3. Akbar, I., Misman, A.F.: “Research on semantics used in GPS based mobile phone applications for blind pedestrian navigation in an outdoor environment,” 2018 International Conference on Information and Communication Technology for the Muslim World (ICT4M), Kuala Lumpur, pp. 196–201, IEEE (2018)
4. Bai, J., Lian, S., Liu, Z., Wang, K., Liu, D.: “Smart guiding glasses for visually impaired people in indoor environment.” In: IEEE Trans. Cossum. Electron. 63(3), 258–266, IEEE (Aug 2017)
5. Lan, F., Zhai, G., Lin, W.: “Lightweight smart glass system with audio aid for visually impaired people,” TENCON 2015—2015 IEEE Region 10 Conference, Macao, pp. 1–4, IEEE (2015)