Da PG. Regularity results for Kolmogorov equations in $L^2 (H, μ)$ spaces and applications. Ukr. Mat. Zhurn. [Internet]. 1997 Mar. 25 [cited 2025 Dec. 6];49(3):448–457. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/5017