Nytrebych, Zinovii, and Oksana Malanchuk. 2019. “THE CONDITIONS OF EXISTENCE OF A SOLUTION OF THE TWO-POINT IN TIME PROBLEM FOR NONHOMOGENEOUS PDE”. Italian Journal of Pure and Applied Mathematics 41 (February):242-50. https://journals.uniurb.it/index.php/ijpam/article/view/7132.