Ravihansa Rajapakse and  Malshika Dias and  Kanishka Weerasekara and  Anuja Dharmaratne and  Prasad Wimalaratne,  Audio User Interface for Visually Impaired Computer Users: in a Two Dimensional Audio Environment.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2012, vol. 65(5). 645 - 652
    [viewed 19 February 2020]. Available from: https://publications.waset.org/pdf/12136.