KONAROVSKA, M. I. Problem with pulse action for systems with Bessel?Kolmogorov operators. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 64, n. 7, p. 945–953, 2012. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2630. Acesso em: 6 dec. 2025.