7Majumdar M, Bhushan B. Fractal Model of Elastic-plastic Contact between Rough Surfaces [J] . ASME Journal of Tribology, 1991, 113: 1-11.
8Wang S, Komvopoulos K. A Fractal Theory of the Interracial Temperature Distribution in the Slow Sliding Regime: Part I-Elastic Contact and Heat Transfer Analysis [J] . ASME Journal of Tribology, 1994, 116: 812-823.