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)