Kaziyev G. Z. and  Nabiyeva G. S. and  Kalizhanova A.U.,  Effective Class of Discreet Programing Problems.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    June 2013, vol. 78(6). 971 - 974
    [viewed 27 April 2024]. Available from: https://publications.waset.org/pdf/12078.