Fedorov, Vladimir, Kseniya Boyko, and Ta Phuong. “Initial Value Problems for Some Classes of Linear Evolution Equations With Several Fractional Derivatives”. Mathematical notes of NEFU 28, no. 3 (October 7, 2021): 85-104. Accessed January 17, 2022. https://mzsvfu.ru/index.php/mz/article/view/initial-value-problems-for-some-classes-of-linear-evolution-equations.