GORIUNOV, A. S. Multi-interval Sturm–Liouville boundary-value problems with distributional potentials . Reports of the National Academy of Sciences of Ukraine, Kyiv, Ukraine, n. 7, p. 43–47, 2025. DOI: 10.15407/dopovidi2014.07.043. Disponível em: https://nasu-periodicals.org.ua/index.php/dp/article/view/16580. Acesso em: 10 may. 2026.