Los, V.M., Mikhailets V.А., and A.A. Murach. “Regularity of Solutions to General Parabolic Problems in Hörmander Spaces”. Reports of the National Academy of Sciences of Ukraine, no. 8 (August 28, 2017): 3–10. Accessed July 11, 2026. https://nasu-periodicals.org.ua/index.php/dp/article/view/7687.