@techreport{NBERw13146,
 title = "Patents and the Survival of Internet-related IPOs",
 author = "Iain M. Cockburn and Stefan Wagner",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "13146",
 year = "2007",
 month = "June",
 URL = "http://www.nber.org/papers/w13146",
}