@techreport{NBERr1517,
 title = "Vertical Integration and Market Foreclosure",
 author = "Oliver Hart and Jean Tirole",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Reprint Series",
 number = "1517",
 year = "1991",
 month = "February",
 URL = "http://www.nber.org/papers/r1517",
 abstract = {},
}