Litovchenko, V.A., and G.M. Unguryan. “Parabolic Systems of Shilov-Type With Coefficients of Bounded Smoothness and Nonnegative Genus”. Carpathian Mathematical Publications 9, no. 1 (June 8, 2017): 72–85. Accessed April 28, 2024. https://journals.pnu.edu.ua/index.php/cmp/article/view/1449.