Vyshenskaya О. V. and N. A. . Perestyuk, “Integral sets of one class of breaking dynamic systems”, Ukr. Mat. Zhurn., vol. 44, no. 5, pp. 589–595, May 1992, Accessed: Apr. 09, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/7953