It might be this one by the IZA. https://ftp.iza.org/dp8823.pdf by Kristoffersen, Krægpøth, Nielsen and Simonsen (2015) or one of the studies they reference in their intro: (Figlio, 2007; Carrell and Hoekstra, 2010; Cho, 2012; Kristoffersen, 2013; and Diette and Uwaifo Oyelere, 2014)