1
Published: 2014.
Links: Get full text
2
Published: 2014.
3
Published: 2011.
4
Published: 2009.
Superior document: Technical report ; TR-728-RER
5
Published: 2012.
6
Published: 2011.
7
Published: 2012.
8
Published: 2011.
Links: Get full text
9
Published: 2009.
Superior document: RAND Corporation monograph series ; MG-838-USCC404-310803432