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WikiPedia: PlanetMath http://www.emeraldinsight.com/10.1108/036849208109... http://www.freesoftwaremagazine.com/files/www.free... http://jpubs.jacobs-university.de/handle/579/143 http://arxiv.org/pdf/cs/0507028 http://planetmath.org/ http://planetmath.org http://planetmath.org/?op=about http://planetmath.org/?op=getobj&from=collab&id=35... http://aux.planetmath.org/doc/donate.html http://planetphysics.org/