http://www.dharwadker.org/tevet/isomorphism
http://www.cs.sunysb.edu/~algorith/files/graph-isomorphism.shtml
http://www.mathe2.uni-bayreuth.de/markus/reggraphs.html
http://www.maths.gla.ac.uk/~es/srgraphs.html
Pairs of tough graphs for the graph isomorphism testing:   Result (the last column = elapsed time in seconds):
     
     
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