1. D. Dowson, Non-steady state effects in EHL, in: William R. Loomis (Ed.), New Directions in Lubrication, Materials, Wear and Surface Interactions, Tribology in the 80’s, Noyes Publications, Park Ridge, NJ, USA, 1985.
2. Wear modelling: analytical, computing and mapping—a continuum mechanics approach;Williams;Wear,1999
3. U.I. Sjödin, Characterisation of wear on piston ring in a radial piston hydraulic motor, in: Proceedings of the World Tribology Congress 2001, Vienna.
4. U.I. Sjödin, U.L.-O. Olofsson, Sliding wear of piston ring flank and piston groove in a hydraulic motor, in: Proceedings of the Presentation at AUSTRIB 2002.
5. 14 (+3) Parameters for 3D Surface Roughness, Centre for Ultra Precision Technologies, University of Huddersfield, Queensgate, Huddersfield HD1 3DH, UK (http://zeus.plmsc.psu.edu/∼manias/MatSc597/roughness/definitions.html).