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2. Atkins v. Virginia, 536 U.S. 304, 2002.
3. The Death Penalty in America: Current Controversies,1998
4. Statistical difficulties in determining the role of race in capital cases: a re-analysis of data from the state of Maryland;Berk;Journal of Quantitative Criminology,2005
5. The Future of Capital Punishment in the United States;Bohm,2013