Nowshin, N.; Shadman, S.; Shadman, S.; Joy, S.; Joy, S.; Aninda, S.; Aninda, S.; Minhajul, I. M.; Minhajul, I. M. An Intelligent Walking Stick for the Visually-Impaired People. Int. J. Onl. Eng. 2017, 13, pp. 94-101.