Evgeny Pyshkin and  Maxim Mozgovoy and  Vladislav Volkov,  Models and Metamodels for Computer-Assisted Natural Language Grammar Learning.   journal   = {International Journal of Educational and Pedagogical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    January 2015, vol. 97(1). 60 - 66
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/10000114.