1. Hybrid bearings lubricated with pure refrigerant liquid;Morales-Espejel;Turbomachinery,2004
2. H.H. Wallin, G.E. Morales-Espejel, Hybrid bearings in oil-free air conditioning and refrigeration compressors, Evolution Online, 2011. 〈http://evolution.skf.com〉.
3. B.O. Jacobson, G.E. Morales-Espejel, High pressure investigation of refrigerants HFC245fa, R134a and R123, in: Proceedings of the International Compressor Engineering Conference. Paper, 1789, 2006. 〈http://docs.lib.purdue.edu/icec/1789〉.
4. L. Kahlman, Oil-flooded screw compressors: predicting MTBF under various H2S, CO2 and H2-rich conditions for rolling bearings designed for process gas use, in: Proceedings of the 2013 Gas Machinery Conference, Albuquerque, 2013.
5. S. Coulon F. Ville A.A. Lubrecht, Experimental investigations of rolling contact fatigue of dented surfaces using artificial defects, Life Cycle Tribology, Elsevier, 2005, pp. 691–702.