YEFIMUSHKIN, A. S.; YEFIMUSHKIN, A. S.; RYAZANOV, V. I. On the regular solutions of the Riemann–Hilbert problem for the Beltrami equations . Reports of the National Academy of Sciences of Ukraine, Kyiv, Ukraine, n. 5, p. 19–23, 2025. DOI: 10.15407/dopovidi2014.05.019. Disponível em: https://nasu-periodicals.org.ua/index.php/dp/article/view/16503. Acesso em: 30 may. 2026.