1. N. Sota, Masatsu no Hanashi, Iwanami Shoten, Tokyo, 1971 (in Japanese).
2. D. Dowson, History of Tribology, Longman, New York, 1979.
3. F.P. Bowden, D. Tabor, Friction and Lubrication of Solids, vol. II, Clarendon Press, Oxford, 1964.
4. Atomic-scale friction of a tungsten tip on a graphite surface
5. Atomistic locking and friction