A two-point problem for systems satisfying a controllability condition with second order Lie brackets. Neliniini Kolyvannya, [S. l.], v. 18, n. 3, p. 357–372, 2015. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/792. Acesso em: 21 jan. 2026.