1. I. I. Novikov and B. S. Lando, ?Calculation of parameters of gas in piston packing,? Khim. Neft. Mashinostr., No. 7, 10?12 (1977).
2. K. English, Piston Rings [in Russian translation], Vol. 2, Mashgiz, Moscow.
3. G. M. Bartenev and V. V. Lavrent'ev, Polymer Friction and Wear [in Russian], Khimiya, Moscow-Leningrad (1972).
4. I. V. Kragel'skii, Friction and Wear [in Russian], Mashinostroenie, Moscow (1968).
5. A. H. Uppal and S. D. Probert, ?Mean separation and real contact area between surfaces pressed together under high static load,? Wear,23, No. 1, 39?53 (1973).