@techreport{NBERw12369,
 title = "Biological Gender Differences, Absenteeism and the Earning Gap",
 author = "Andrea Ichino and Enrico Moretti",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "12369",
 year = "2006",
 month = "July",
 URL = "http://www.nber.org/papers/w12369",
}