Blackmore D, Prykarpatsky AK, Prykarpatsky YA, Samoilenko AM. Theory of multidimensional Delsarte – Lions transmutation operators. I. Ukr. Mat. Zhurn. [Internet]. 2018Dec.25 [cited 2024Nov.23];70(12):1660-95. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/1667