1. The transition from the wear to the stress regime;Tournay;Wear,1996
2. How damaging are hollow-worn wheels?;Sawley;Railway Age,1999
3. Engineering and economic implications of hollow worn wheels on wheel and rail asset life and fuel consumption;Sawley,1999
4. K. Sawley, S.L. Clark, The Economics of Removing Hollow Wheels from Service, TTCI Technology Digest 99-034, December 1999.
5. K.J. Sawley, D. Oliva-Maal, J. LoPresti, Effect of hollow worn railroad wheels on fuel use and track damage, RTD-Vol. 15, Rail Transportation, ASME 1998, pp. 71–76.