MaslyukH. O., and MikhailetsV. A. “Continuity in the Parameter for the Solutions of One-dimensional boundary-Value Problems for Differential Equations of Higher Orders in Slobodetsky Spaces”. Ukrains’kyi Matematychnyi Zhurnal 70, no. 3 (March 25, 2018): 404-411. Accessed December 5, 2020. http://umj.imath.kiev.ua/index.php/umj/article/view/1564.