Vyshenskaya О. V., and Perestyuk N. A. “Integral Sets of One Class of Breaking Dynamic Systems”. Ukrains’kyi Matematychnyi Zhurnal 44, no. 5 (May 26, 1992): 589-595. Accessed November 28, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/7953.