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Published: 2011.
2
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Published: 2008.
4
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6
Published: 2012.
7
Published: 2007.
Superior document: Rand Publication Series
8
9
Published: 2015
10
Published: 2015
11
Published: 2010.
12
Published: 2001.
13
Published: 2010.
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14
Published: 2009.
Superior document: RAND Corporation monograph series ; MG-838-USCC404-310803432