Steen – Ermakov – Pinney equation and integrable nonlinear deformation of one-dimensional Dirac equation. Neliniini Kolyvannya, [S. l.], v. 20, n. 2, p. 267–273, 2017. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/867. Acesso em: 21 jan. 2026.