KASIRENKO, T. General elliptic boundary-value problems in Hörmander—Roitberg spaces . Reports of the National Academy of Sciences of Ukraine, Kyiv, Ukraine, n. 2, p. 3–11, 2018. DOI: 10.15407/dopovidi2018.02.003. Disponível em: https://nasu-periodicals.org.ua/index.php/dp/article/view/2536. Acesso em: 30 may. 2026.