WASET
    Pham Ba Quang and  Nguyen Tien Dat and  Huynh Quyet Thang,  Investigate the Relation between the Correctness and the Number of Versions of Fault Tolerant Software System .   journal   = {International Journal of Computer and Systems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2007, vol. 3(3). 732 - 737
    [viewed 18 April 2024]. Available from: https://publications.waset.org/pdf/456.