POKROVSKII, A. A simple proof of the Radó and Král theorems on removability of the zero locus for analytic and harmonic functions . Reports of the National Academy of Sciences of Ukraine, Kyiv, Ukraine, n. 7, p. 29–31, 2025. DOI: 10.15407/dopovidi2015.07.029. Disponível em: https://nasu-periodicals.org.ua/index.php/dp/article/view/15068. Acesso em: 18 apr. 2026.