Punam Bedi and  Sudeep Marwaha,  Versioning OWL Ontologies using Temporal Tags .   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2007, vol. 3(3). 686 - 691
    [viewed 29 October 2021]. Available from: https://publications.waset.org/pdf/12579.