Nikolay Prodanov, Wolf. B. Dapp, and Martin H. Müser,
On the contact area and mean gap of rough, elastic contacts:
Dimensional analysis, numerical corrections and reference data,
Tribol. Lett. 53, 433–448 (2014).
DOI: 10.1007/s11249-013-0282-z,
arxiv: http://arxiv.org/abs/1311.7547.