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Villarreal A, Sakamoto A.Villarreal A, et al.Soc Sci Res. 2011 May 1;40(3):885-901. doi: 10.1016/j.ssresearch.2010.12.011.Soc Sci Res. 2011.PMID: 21566699Free PMC article.
Villarreal A, Hamilton ER.Villarreal A, et al.Soc Sci Res. 2012 Sep;41(5):1275-91. doi: 10.1016/j.ssresearch.2012.02.007. Epub 2012 Mar 7.Soc Sci Res. 2012.PMID: 23017932
Hamilton ER, Villarreal A, Hummer RA.Hamilton ER, et al. Among authors: villarreal a.Popul Res Policy Rev. 2009;28(2):123-142. doi: 10.1007/s11113-008-9097-2.Popul Res Policy Rev. 2009.PMID: 20047012Free PMC article.
Villarreal A, Blanchard S.Villarreal A, et al.Demography. 2013 Apr;50(2):751-75. doi: 10.1007/s13524-012-0153-5.Demography. 2013.PMID: 23073750Free PMC article.