PRYKARPATSKY, A. K.; SAMOILENKO, V. G. Structure of Binary Darboux-Type Transformations for Hermitian Adjoint Differential Operators. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 56, n. 2, p. 271–275, 2004. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3751. Acesso em: 6 dec. 2025.