“The generalized De Rham-Hodge theory of Delsarte transmutation operators in multidimension case and its applications”, НК, vol. 7, no. 4, pp. 516–537, Dec. 2004, Accessed: Jan. 22, 2026. [Online]. Available: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/327