NIKITIN, A. G. Superintegrable and scale invariant quantum systems with position dependent mass. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 74, n. 3, p. 360–372, 2022. DOI: 10.37863/umzh.v74i3.7162. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/7162. Acesso em: 5 dec. 2025.