1. M. H. A. Wahab, A. A. Talib, H. A. Kadir, et al. (2011). Smart cane: Assistive cane for visually-impaired people, IJCSI International Journal of Computer Science, Vol. 8, Issue 4, No 2.
2. Y. Yi and L. Dong, (2015). A design of blind-guide crutch based on multisensors, IEEE 12th International Conference on Fuzzy Systems and Knowledge Discovery (FSKD), pp. 2288--2292.
3. A. Patankar and T. Nikoubin, (2016). Wearable system for obstacle detection and human assistance using ultrasonic sensor array, ICCCNT, ACM.
4. W. C. Simos and V.F. de Lucena, (2016). Blind user wearable Audio assistance for indoor nanigation based on visual markers and ultrasonic obstacle detection, IEEE International Conference on Consumer Electronics (ICCE), pp. 60--63.
5. D. Zhou, Y. Yang and H. Yan, (2016). A smart "virtual eye" mobile system for the visually impaired, IEEE Potentials, Vol. 35, Issue 6.