Life In 19x19

Can anyone recommend some good online resources regarding organizing tournaments? I am in particular interested in the math and software implementation of various pairing systems, more theoretical than practical.

Some links

https://www.usgo.org/files/pdf/AGAMcMah ... otocol.pdf
https://www.usgo.org/files/pdf/AGAMcMah ... erface.pdf
https://www.usgo.org/files/pdf/AGATDGuide.pdf

And from this side of the pond:
http://britgo.org/organisers/handbook/tournamentd.html
GoDraw is the pairing program we use by Geoff Kaniuk:
http://britgo.org/downloads/godraw/index.html
One by Christoph Gerlach is often used in Europe I believe: http://senseis.xmp.net/?MacMahonTheProgram, see also http://senseis.xmp.net/?MaximumWeightPerfectMatching