TRIGUB, M. V. On optimal control over quasilinear systems. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 47, n. 9, p. 1280–1294, 1995. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5529. Acesso em: 5 dec. 2025.