Stern Brocot again

John Chalmers had pointed out that the last link I gave for the
Stern-Brocot tree wasn't about that at all. This is the one I was
thinking of:

http://www.cut-the-knot.com/blue/Stern.html

I've also found an online version of the American Scientist article that
started it all off:

<http://www.sigmaxi.org/amsci/issues/Comsci00/compsci2000-07.html>