1. C.-S., Hsieh, Electronic walking stick for the blind. U.S. Patent No. 5,097,856, 24 Mar. 2010
2. E. Evanitsky, Portable blind aid device. U.S. Patent No. 8,606,316, 10 Dec. 2013
3. H.O. Cervantes, Intelligent glasses for the visually impaired.” U.S. Patent No. 9,488,833. 8 Nov. 2016
4. A. Jothimani, S. Edward, G.K. Divyashree, Object identification for visually impaired. Indian J. Sci. Technol. 9.S1, 2016
5. J.S. Zraqou, W.M. Alkhadour, M.Z. Siam, Real-Time objects recognition approach for assisting blind people, 2017