Baranetskyi, Ya. “A NONLOCAL PROBLEM WITH MULTIPOINT PERTURBATIONS OF PERIODIC CONDITIONS FOR DIFFERENTIAL-OPERATOR EQUATIONS OF EVEN ORDER”. Bukovinian Mathematical Journal 6, no. 3-4 (March 29, 2019). Accessed May 19, 2024. https://bmj.fmi.org.ua/index.php/adm/article/view/901.