1. S. Korcek, R.K. Jensen, M.D. Johnson, J. Sorab, Fuel efficient engine oils, additive interactions, boundary friction and wear, in Lubrication at the Frontier, in: Proceedings of the Leeds–Lyon Symposium on Tribology, Elsevier, Amsterdam; Tribol. Ser. 36 (1999) 13–24.
2. Tribological investigation of piston ring coatings operating in an alternative fuel and engine oil blend;Tung;Tribol. Trans.,2002
3. S.C. Tung, Y.T. Cheng, Tribological characteristics and microstructures of PVD thin film coatings on steel substrates, in: Proceedings of the International Wear Conference, San Francisco, California, 12–17 April 1993.
4. A. Gangopadhyay, Development of a Piston Ring-Cylinder Bore Wear Model, SAE Technical Paper No. 2000-01-1788, 2000.
5. Y. Jeng, Topographical Changes of Engine Bores During Engine Running In, SAE Technical Paper No. 2000-01-1791, 2000.