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3. T.R. Thomas, private communication.
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5. T. Tsukizoe and T. Hisakado, ‘On the Mechanism of Contact between Metal Surfaces —The Penetrating Depth and the Average Clearance’, Trans. ASME, 87, 1965, pp. 666–674 and Part n: ‘The Real Area and the Number of the Contact Points’, Trans. ASME J. of Lubrication Technology, 90, 1968, pp. 81–88.