Georgi I. Petkov and  Ivan I. Vankov and  Yolina A. Petrova,  Discovering the Dimension of Abstractness: Structure-Based Model that Learns New Categories and Categorizes on Different Levels of Abstraction.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2018, vol. 140(8). 586 - 591
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/10009281.