1. Interdisciplinary Approach to the Lubrication of Concentrated Contacts, A NASA Symposium,1969
2. H. Christensen, Tribology of rough surfaces: failure of hydrodynamic film due to thermal collapse. SINTEF research report (in preparation).
3. A theory of mixed lubrication;Christensen,1972
4. Thermal instability in oscillating bearings;Jakobsen,1967