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3Jeffrey Passel,D' Vera Cohn,Ana Gonzalez-Barrera. "Net Migration from Mexico Falls to Zero-and Perhaps Less"[M].Pew Research Hispanic Center,2012.
4Nolan McCarty,Keith T. Poole and Howard Rosenthal,"Does Gerrymandering Cause Polarization "[J].AMERICAN JOURNAL OF POLITICAL SCIENCE,2009,(3).
