Andreev, E., D. Volkov, A. Orlov, S. Timofeev, M. Turubanov, L. Chubraeva, and V. Shishlakov. “Physical Simulation of Friction Loss in Idling Synchronous Generators”. Information and Control Systems, no. 3, June 2011, pp. 34-38, https://i-us.ru/index.php/ius/article/view/13867.