Paggi, Marco and Carpinteri, Alberto Size-Scale Effects on the Friction Coefficient: From Weak Faults at the Planetary Scale to Superlubricity at the Nanoscale. In: Recent Advances in Contact Mechanics. Lecture Notes in Applied and Computational Mechanics, 56 . Springer, pp. 67-84. ISBN 978-3-642-33967-7 (2013)