Aissam Belghiat and  Mustapha Bourahla,  Automatic Generation of OWL Ontologies from UML Class Diagrams Based on Meta- Modelling and Graph Grammars.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2012, vol. 68(8). 967 - 972
    [viewed 21 October 2021]. Available from: https://publications.waset.org/pdf/680.