1. ‘Piston Ring Lubrication. Part II – Theoretical Analysis of a Single Ring and a Complete Ring Pack’;Dowson,1973
2. The Elastohydrodynamic Lubrication of Piston Rings;Dowson;Proc. R. Soc. London,1983
3. Ewiss, M. (1935). ‘Reibungs-und Undichtigkeitsverluste an Kolbenringen’, Forschungshefte des Vereins Deutscher Ingenieure, No. 371.
4. ‘Description of a Spiral Coil Piston Packing’;Joy;Proc. I. Mech.E.,1855
5. ‘On a Packing for Pistons of Steam Engines and Pumps’;Miller;Proc. I. Mech.E.,1862