P. Kolpak, Eugeny, and Ekaterina V. Gorynya. “Msthematical Model of Operational Competition”. International Journal of Engineering & Technology 7, no. 3.19 (September 7, 2018): 85–91. Accessed November 22, 2024. https://sciencepubco.com/index.php/ijet/article/view/16992.