Andrusiak I, Brodyak O. Integral Representations Of Positive Definite Kernels For Second-Order Elliptic Operators. Number [Internet]. 2026 Apr. 24 [cited 2026 Apr. 25];(22(83):18-2. Available from: https://www.pvntsh.nung.edu.ua/index.php/number/article/view/2230