SOBOLJEV, Vladyimir-Andrejevich. INTEGRAL MANIFOLDS AND SOME OPTIMAL CONTROL PROBLEMS Periodica Polytechnica Mechanical Engineering, [S. l.], v. 31, n. 1, p. 87–102, 1987. Disponível em: https://pp.bme.hu/me/article/view/5689. Acesso em: 18 may. 2024.