1. Technical Railroad Dictionary, Ed. by N. N. Vasil’ev, O. N. Isaakyan, N. O. Roginskii, et al. (Gos. Trans. Zhel. Izd., Moscow, 1941). http://dic.academic.ru/contents.nsf/railway/.
2. http://ru.wikipedia.org/wiki/%D0%9C%D0%BE%D0%BD%D0%BE%D1%80%D0%B5%D0%BB%D1%8C%D1%81.
3. Passenger Monorail Railroads, Ed. by A. P. Mikheev (Mashinostroenie, Moscow, 1969), p. 240 [in Russian].
4. http://yandex.ru/images/search?source=wiz&img_url=http%3A%2F%2Fimg.findpatent.ru%2Fimg_data%2F213%2F2137883-s.gif&uinfo=sw-1920-sh-1080-ww1903-wh-940-pd-1-wp-16x9_1920x1080&_=1420310295091&viewport=wide&p=2&text=%D0%BF%D0%BE%D0%B4%D0%B2%D0%B5%D1%81%D0%BD%D1%8B%D0%B5%20%D0%B6%D0%B5%D0%BB%D0%B5%D0%B7%D0%BD%D1%8B%D0%B5%20%D0%B4%D0%BE%D1%80%D0%BE%D0%B3%D0%B8&noreask=1&pos=60&rpt=simage&lr=213&pin=1.
5. A. Albert, Regression and the Moor–Penrose Pseudoinverse (Academic, New York, 1972; Nauka, Moscow, 1977).