http://www.theregister.co.uk/2005/08/15/women_it_maths_mandatory/ The research in question seems to be a forthcoming book from MIT Press: Charles, Maria and Karen Bradley. “A Matter of Degrees: Female Underrepresentation in Computer Science Programs Cross-Nationally.” In Joanne McGrath Cohoon and Bill Aspray, eds. Women and Information Technology: Research on the Reasons for Underrepresentation. Cambridge, MA: MIT Press. Thank Rob Taylor