We apologize unreservedly to the authors for the poor quality of the reproduction of the figures in their paper. These are now reproduced in the form in which they were originally intended.
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References
1.
MarshallM BLewisRDrinkwaterB WDwyer-JoyceR.S.Journal of Strain Analysis, Vol. 39, No. 4, pages 339–350 (in Special Issue on Contact Mechanics)