http://www.imo2015.org/

Thailand is proud to serve as a first-time IMO host. From the very first competition in 1959 in Romania, the IMO has grown steadily and impressively, and this year we are happy to have young math aces from 107 countries around the world taking part in the competition.

http://issuu.com/imo2015newsletter/docs/imo_newsletter_issue_1/3?e=18322693/14120597