HumenchukH. I. “On the Sum of Narrow and Finite-Rank Orthogonally Additive Operators”. Ukrains’kyi Matematychnyi Zhurnal 67, no. 12 (December 25, 2015): 1620-1625. Accessed November 23, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2095.