Saraiva , Álvaro, and Walter Valenzuela. “System of Indication of Directions and Warnings Against Collisions for Locomotion of People With Impaired Vision in Structured Environments”. ITEGAM-JETIA 1, no. 4 (December 22, 2015). Accessed November 18, 2024. http://br940.teste.website/~itegamjetia/journal/index.php/jetia/article/view/211.