Kapustyan, V. O., P. O. Kasyanov, and O. P. Kohut. “On the Solvability of One Class of Parameterized Operator Inclusions”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 60, no. 12, Dec. 2008, pp. 1619–1630, https://umj.imath.kiev.ua/index.php/umj/article/view/3276.