Nechaev, I.N., M.U. Shkurnikov, and D.G. Maximenko. 2012. “Determination of Susceptibility to the Development of Disorders of the Cardiovascular System in Young Athletes in the Moscow Region”. Patologicheskaya Fiziologiya I Eksperimental’naya Terapiya (Pathological physiology and experimental Therapy) 56 (4):94-97. https://pfiet.ru/article/view/5359.