MATVIICHUK, K. S. On conditions of technical stability of controlled processes with distributed parameters. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 49, n. 10, p. 1337–1344, 1997. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5132. Acesso em: 5 dec. 2025.