Shen, H. ., Chan, K.-Y. ., Coughlan, J. ., & Brabyn, J. . (2008). A mobile phone system to find crosswalks for visually impaired pedestrians. Technology and Disability, 20, 217–224.
Chan, K.-Y. ., Manduchi, R. ., & Coughlan, J. . (2007). Accessible spaces: navigating through a marked environment with a camera phone. Proceedings of the 9th International ACM SIGACCESS Conference on Computers and Accessibility, 229–230. ACM.