LEVIN, V. I. DERIVATIVES OF ELEMENTARY INTERVAL FUNCTIONS. Radio Electronics, Computer Science, Control, [S. l.], n. 4, 2017. DOI: 10.15588/1607-3274-2016-4-3. Disponível em: http://ric.zntu.edu.ua/article/view/90267. Acesso em: 27 apr. 2024.