1. Elastic deformation and the contact of surfaces;Archard;Nature,1951
2. Contact of nominally flat surfaces;Greenwood,1966
3. Metallographic grain size determination: I. Measuring techniques;Kostron;Arch. Metallk.,1949
4. The Fractal Geometry of Nature;Mandelbrot,1982
5. Character of fracture surfaces of metals;Mandelbrot;Nature,1984