Ciavarella, Michele and Paggi, Marco and Carpinteri, Alberto  One, no one, and one hundred thousand crack propagation laws: a generalized Barenblatt and Botvina dimensional analysis approach to fatigue crack growth.  Journal of the Mechanics and Physics of Solids, 56 (12).  3416 - 3432.  ISSN 0022-5096      (2008)