@techreport{NBERw14069,
 title = "International R&D Spillovers and Institutions",
 author = "David T. Coe and Elhanan Helpman and Alexander W. Hoffmaister",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "14069",
 year = "2008",
 month = "June",
 URL = "http://www.nber.org/papers/w14069",
}