?url_ver=Z39.88-2004&rft_id=10.1103%2FPhysRevE.63.021118&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Caldarelli%2C+Guido&rft.aufirst=Guido&rft.aulast=Caldarelli&rft.issn=1539-3755&rft.atitle=Cellular+models+for+river+networks&rft.title=Physical+Review+E&rft.date=January+2001&rft.volume=63&rft.issue=2&rft.genre=article