?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=Fabio&rft.aulast=Pammolli&rft.au=Pammolli%2C+Fabio&rft.btitle=Antonio+Nicita+and+Ugo+Pagano+(eds).+The+Evolution+of+Economic+Diversity&rft.title=Variety+and+Irreversibility+in+Scientific+and+Technological+Systems%3A+the+Evolution+of+an+Industry+Network&rft.date=2001&rft.isbn=978-0415221924&rft.tpages=464&rft.genre=bookitem