1. Akitaseiko (1976) http://www.akitaseiko.jp
2. Android (2003) http://www.android.com/
3. Bahadir SK, Koncar V, Kalaoglu F (2012) Wearable obstacle detection system fully integrated to textile structures for visually impaired people. Sens Actuators A Phys 179:297–311
4. Benjamin JM, Ali NA, Schepis AF (1973) A laser cane for the blind. Proc S Diego Biomed Symp 12:53–57
5. Bernabei D, Ganovelli F, Benedetto MD, Dellepiane M, Scopigno R (2011) A low-cost time-critical obstacle avoidance system for the visually impaired. In: International conference on indoor positioning and indoor navigation, pp 21–23