Mehrdad Mahdavi Boroujerdi and  Soheil Nazem,  Cloud Computing: Changing Cogitation about Computing.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2009, vol. 34(10). 2469 - 2473
    [viewed 27 January 2020]. Available from: https://publications.waset.org/pdf/8500.