MAKAROV, V.; ROMANYUK, N. New properties of the FD-method in its applications to the Sturm-Liouville problems . Reports of the National Academy of Sciences of Ukraine, Kyiv, Ukraine, n. 2, p. 26–31, 2025. DOI: 10.15407/dopovidi2014.02.026. Disponível em: https://nasu-periodicals.org.ua/index.php/dp/article/view/17433. Acesso em: 10 may. 2026.