18 March 2014 | Publisher: United States Congressional Research Service | Document type: Research, Background and Discussion Papers
4 March 2011 | Publisher: United States Congressional Research Service | Document type: Research, Background and Discussion Papers
March 2011 | Publisher: UN High Commissioner for Refugees (UNHCR) | Document type: Research, Background and Discussion Papers
23 December 2010 | Publisher: United States Congressional Research Service | Document type: Research, Background and Discussion Papers
December 2008 | Publisher: UN High Commissioner for Refugees (UNHCR) | Document type: Research, Background and Discussion Papers