@techreport{NBERw12693,
 title = "Educational Mismatch Among Ph.D.s:  Determinants and Consequences",
 author = "Keith A. Bender and John S. Heywood",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "12693",
 year = "2006",
 month = "November",
 URL = "http://www.nber.org/papers/w12693",
}