WASET
    Stefan Wagenpfeil and  Felix Engel and  Paul McKevitt and  Matthias Hemmje,  Graph Codes-2D Projections of Multimedia Feature Graphs for Fast and Effective Retrieval.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    December 2021, vol. 180(12). 636 - 648
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/10012350.