GLADKA, Z. On a reflection coefficient for the Schrödinger operator with a smooth potential . Reports of the National Academy of Sciences of Ukraine, Kyiv, Ukraine, n. 9, p. 7–12, 2025. DOI: 10.15407/dopovidi2014.09.007. Disponível em: https://nasu-periodicals.org.ua/index.php/dp/article/view/16676. Acesso em: 18 apr. 2025.