The form of discrete spectrum in the case of high singular potential Vladimír Lelek, Jan Wiesner (1971) Aplikace matematiky
The inverse problem for the one-dimensional Schrödinger equation with an energy-dependent potential. I M. Jaulent, C. Jean (1976) Annales de l'I.H.P. Physique théorique
The inverse problem for the one-dimensional Schrödinger equation with an energy-dependent potential. II M. Jaulent, C. Jean (1976) Annales de l'I.H.P. Physique théorique