NESTERENKO, V. V. Ostrohrads’kyi Formalism for Singular Lagrangians with Higher Derivatives. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 53, n. 8, p. 1034–1037, 2001. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4323. Acesso em: 6 dec. 2025.