19 February 2013 | Publisher: United States Congressional Research Service | Document type: Research, Background and Discussion Papers
April 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
2005 | Publisher: UN Office of the High Commissioner for Human Rights (OHCHR) | Document type: Research, Background and Discussion Papers