Irina Astrova and  Nahum Korda and  Ahto Kalja,  Storing OWL Ontologies in SQL Relational Databases .   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2007, vol. 5(5). 1261 - 1266
    [viewed 24 October 2021]. Available from: https://publications.waset.org/pdf/8866.