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Sep 11, 2013 at 8:55 comment added Gordon Royle In fact, 20 years ago (almost) Chris published his "Problems in Algebraic Combinatorics" in a very early volume of the Electronic Journal of Combinatorics asking among other things, "Is there an eighth triangle-free SRG?" the answer to which is still unknown.
Sep 10, 2013 at 17:08 history answered Chris Godsil CC BY-SA 3.0