Alam, Umme Kawsar, Fazle Rabby, and M. T. Islam. “Development of a Technical Device Named GPS Based Walking Stick for the Blind”. Rajshahi University Journal of Science and Engineering 43 (December 31, 2015): 73–80. Accessed August 31, 2024. https://banglajol.info/index.php/RUJSE/article/view/26153.