Cvetković, A. S., Milovanović, G. V. and Stanić, M. P. (2015) “Positive Solutions of a Class of Operator Equations”, Ukrains’kyi Matematychnyi Zhurnal, 67(2), pp. 245-260. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/1977 (Accessed: 23April2024).