?url_ver=Z39.88-2004&rft_id=10.1209%2Fepl%2Fi1997-00491-5&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=Guido&rft.au=Caldarelli%2C+Guido&rft.aulast=Caldarelli&rft.date=October+1997&rft.atitle=A+prototype+model+of+stock+exchange&rft.issn=0295-5075+&rft.pages=479-484&rft.issue=5&rft.title=EPL+(Europhysics+Letters)&rft.volume=40&rft.genre=article