Bulavin, D. A., Goncharenko, E. V. and Shmatkov, S. I. (2016) “Structural model of the non-formal education system”, Bulletin of V.N. Karazin Kharkiv National University, series «Mathematical modeling. Information technology. Automated control systems», 300, pp. 5-13. Available at: https://periodicals.karazin.ua/mia/article/view/6562 (Accessed: 22November2024).