?url_ver=Z39.88-2004&rft_id=10.1103%2FPhysRevE.73.066123&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=Kwang-Il&rft.aulast=Goh&rft.au=Goh%2C+Kwang-Il&rft.pages=066123&rft.volume=73&rft.date=June+2006&rft.atitle=Structure+and+evolution+of+online+social+relationships%3A+heterogeneity+in+unrestricted+discussions&rft.title=Physical+Review+E&rft.issn=1539-3755&rft.genre=article