Lozynska, V.Ya. “Exponential Type Distributions and a Generalized Functional Calculus for Generators of $C_0$-Groups”. Carpathian Mathematical Publications 3, no. 1 (June 30, 2011): 73–84. Accessed December 4, 2024. https://journals.pnu.edu.ua/index.php/cmp/article/view/3089.