The generalized De Rham-Hodge theory of Delsarte transmutation operators in multidimension case and its applications. Neliniini Kolyvannya, [S. l.], v. 7, n. 4, p. 516–537, 2004. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/327. Acesso em: 22 jan. 2026.