Chyzhykov, I.E., M.M. Sheremeta, and O.B. Skaskiv. “A. A. Goldberg – 90”. Matematychni Studii 54, no. 2 (December 26, 2020): 220-221. Accessed July 18, 2024. http://matstud.org.ua/ojs/index.php/matstud/article/view/165.