The China Girls Math Olympiad is a math competition with a proof-based format similar to the International Math Olympiad. It was originally organized in 2002 for teams of girls representing different regions within China. Later, the Chinese organizers decided to invite other nations to send teams of girls from their countries. Russia has participated at least since 2004. The United States first participated in 2007.
"At the China Girls Math Olympiad" in FOCUS, November 2007 pages 10-11. A PDF of this issue is available on-line at http://www.maa.org/pubs/pastissues.html .
Mathematical Sciences Research Institute: US Team travelogue for 2010 China Girls Math Olympiad
Mathematical Sciences Research Institute: US Team travelogue for 2009 China Girls Math Olympiad
Mathematical Sciences Research Institute: US Team travelogue for 2008 China Girls Math Olympiad
Mathematical Association of America: China Girls Math Olympiad: Success for US Teams
Mathematical Sciences Research Institute: US Team travelogue for 2007 China Girls Math Olympiad
The St. Petersburg Times: City Girl Gets Gold in World Math Olympiad
Voice of America: First US Team to Compete in the China Girls Math Olympiad