Jorge Estudillo Ramirez and  Saul E. Pomares Hernandez,  A Temporal Synchronization Model for Heterogeneous Data in Distributed Systems.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    December 2008, vol. 24(12). 4172 - 4176
    [viewed 25 January 2020]. Available from: https://publications.waset.org/pdf/6354.