Kopytko, B.I., and A.F. Novosyadlo. “On a Nonclassical Problem for the Heat Equation and the Feller Semigroup Generated by It”. Carpathian Mathematical Publications 12, no. 2 (November 3, 2020): 297–310. Accessed November 22, 2024. https://ktipe.pnu.edu.ua/index.php/cmp/article/view/4125.