CZYZEWSKI, A.; KOSTEK, B. Signalization system for visually impaired people. Canadian Acoustics, [S. l.], v. 24, n. 2, p. 29–35, 1996. Disponível em: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/981. Acesso em: 19 apr. 2024.