The Legacy of Andrei Nikolaevich Kolmogorov (http://www.kolmogorov.com/) April 25, 1903 - October 20, 1987. Curriculum Vitae and Biography. Kolmogorov School. Ph.D. students and descendants of A. N. Kolmogorov. A.N. Kolmogorov works, books, papers, articles. Photographs and Portraits of A. N. Kolmogorov.
... inside the groove, the friction between the axis and the groove rims will accelerate or brake the spinning gyroscope, with a maximum effect when the axis starts ...