BLACKMORE, D.; PRYKARPATSKY, A. K.; PRYKARPATSKY, Ya. A.; SAMOILENKO, A. M. Theory of multidimensional Delsarte – Lions transmutation operators. II. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 71, n. 6, p. 808–839, 2019. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1478. Acesso em: 5 dec. 2025.