1. Collected Scientific Papers of Sir William Bate Hardy;Hardy,1936
2. The oil film in a closing gap;Christensen,1962
3. Elastohydrodynamic theory for spherical bodies in normal approach;Christensen;J. Lubr. Technol., Trans. ASME,1970
4. Impact of a lubricated surface by a sphere;Conway;J. Lubr. Technol., Trans. ASME, (F),1975
5. Elasto hydrodynamic lubrication of line contacts subjected to time dependent loading with particular reference to roller bearings and cams and followers;Bedewi,1985