MIKHAILETS, V.; SKOROBOHACH, T. Fredholm boundary- value problems with parameter in Sobolev— Slobodetsky spaces. Reports of the National Academy of Sciences of Ukraine, Kyiv, Ukraine, n. 4, p. 3–8, 2021. DOI: 10.15407/dopovidi2021.04.003. Disponível em: https://nasu-periodicals.org.ua/index.php/dp/article/view/2021-4-1. Acesso em: 22 mar. 2025.