1. Bowden F.P., Tabor D., (1950). The Friction and Lubrication of Solids. Oxford University Press, London
2. Needs S.J., (1940) Trans. ASME 62:331
3. B.V. Deryaguin (ed.), Research in Surface Forces Vol. 1 (1960);
4. Translation by Consultants Bureau, New York (1964)
5. B. V. Deryaguin (ed.), Research in Surface Forces Vol. 2 (1964);