Den Outer, A.; Kaashoek, J.F.; Hack, H.R.G.K. (1995). "Difficulties of using continuous fractal theory for discontinuity surfaces". International Journal of Rock Mechanics & Mining Sciences & Geomechanics Abstracts. 32 (1): 3–9. doi:10.1016/0148-9062(94)00025-X.
Surface texture : surface roughness, waviness, and lay. New York: American Society of Mechanical Engineers. 2020. ISBN978-0-7918-7325-0. OCLC1197629204.