1. ‘Squeeze Films in Elastohydrodynamic Lubrication’;Safa,1985
2. Dowson, D and Wang, D. ‘An Analysis of the Normal Bouncing of a Solid Elastic Ball on an Oily Plate’, Proceedings of the 6th Nordic Symposium on Tribology, Nordtrib 1994, (1994), Volume 1, 85–101 and Wear, Vol. 179, 29–37
3. “Elastohydrodynamic Lubrication at Pure Squeeze Motion’;Larsson;WEAR,1984
4. “The Oil Film in a Closing Gap”;Christensen;Proc. R. Soc., London, Series A,1962
5. ‘Impact of a Lubricated Surface by a Sphere’;Conway;J. Lubr. Technol., Trans ASME,1975