?url_ver=Z39.88-2004&rft_id=10.1103%2FPhysRevE.49.2673&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Caldarelli&rft.aufirst=Guido&rft.au=Caldarelli%2C+Guido&rft.issn=1539-3755&rft.date=April+1994&rft.title=Physical+Review+E&rft.atitle=Fractal+and+topological+properties+of+directed+fractures&rft.issue=4&rft.pages=2673-2679&rft.volume=49&rft.genre=article