1. Advisory Committee on Student Financial Assistance (ACSFA). 2010 The Rising Price of Inequality: How Inadequate Grant Aid Limits College Access and Persistence http://www2.ed.gov/about/bdscomm/list/acsfa/rpijunea.pdf
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4. The Evolution of Class Inequality in Higher Education;Alon;American Sociological Review,2009
5. Two-Stage Least Squares Estimation of Average Causal Effects in Models with Variable Treatment Intensity;Angrist;Journal of the American Statistical Association,1995