[1] International Chemistry Olympiad: url = http://olympiads.win.tue.nl/icho/.
[2] IChO Survey Reply Sheet: url = http://ce.t.soka.ac.jp/chem/ichorep.html.
[3] 31st International Chemistry Olympiad (1999): url = http://scicsws01.sci.ku.ac.th:80/~icho31/ (no longer available).
[4] Countries Participating in the International Chemistry Olympiad (1998): url = http://apamac.ch.adfa.oz.au/ASO/IChO/countries.html (no longer available).
[5] Yahoo! Japan: url = http://www.yahoo.co.jp/.