WASET
    Nathan C. Lea and  Tony Austin and  Stephen Hailes and  Dipak Kalra,  Expression of Security Policy in Medical Systems for Electronic Healthcare Records.   journal   = {International Journal of Health and Medical Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2009, vol. 29(5). 470 - 474
    [viewed 28 March 2024]. Available from: https://publications.waset.org/pdf/6983.