Fracture roughness scaling: A case study on planar cracks S. Santucci, M. Grob, R. Toussaint, J. Schmittbuhl, A. Hansen and K. J. Maløy EPL, 92 4 (2010) 44001 Published online: 18 November 2010 DOI: 10.1209/0295-5075/92/44001