Reversibility of the nonlinear operator $(\mathcal{L}x)(t)=H\bigl(x(t),\frac{d x(t)}{dt}\bigr)$ in the space of functions bounded on the real axis. Neliniini Kolyvannya, [S. l.], v. 11, n. 3, p. 421–436, 2008. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/490. Acesso em: 21 jan. 2026.