GANDEL’, Y.; DUSHKIN, V. Boundary integral equations of the third boundary-value problem for the Helmholtz equation in R2+ with plane-parallel slits . Reports of the National Academy of Sciences of Ukraine, Kyiv, Ukraine, n. 8, p. 14–19, 2025. DOI: 10.15407/dopovidi2014.08.014. Disponível em: https://nasu-periodicals.org.ua/index.php/dp/article/view/16604. Acesso em: 10 may. 2026.