Rights:
© 2007 American Physical Society (APS). This is the accepted version of the following article: Nukala, Phani K. V. V. & Zapperi, Stefano & Alava, Mikko J. & Simunovic, Srdan. 2007. Effect of disorder and notches on crack roughness. Physical Review E. Volume 76, Issue 5. 056111/1-6. ISSN 1539-3755 (printed). DOI: 10.1103/physreve.76.056111, which has been published in final form at http://journals.aps.org/pre/abstract/10.1103/PhysRevE.76.056111.