Chaikovs’kyi, A., and O. Lagoda. “Bounded Solutions of a Difference Equation With Finite Number of Jumps of Operator Coefficient”. Carpathian Mathematical Publications 12, no. 1 (June 28, 2020): 165–172. Accessed April 19, 2024. https://journals.pnu.edu.ua/index.php/cmp/article/view/3899.