ZOLOTAREV, V. A. Direct and inverse problems for finite-dimensional perturbations of operators . Reports of the National Academy of Sciences of Ukraine, Kyiv, Ukraine, n. 1, p. 7–12, 2025. DOI: 10.15407/dopovidi2015.01.007. Disponível em: https://nasu-periodicals.org.ua/index.php/dp/article/view/12908. Acesso em: 11 jan. 2025.