The chromatic number of the double-star snark is 3. Layout from MathWorld <a rel="nofollow" class="external autonumber" href="http://mathworld.wolfram.com/DoubleStarSnark.html">[1]</a>. Derived from Isaacs, R. (1975), “Infinite families of non-trivial trivalent graphs which are not Tait-colorable”, in <cite><a href="//commons.wikimedia.org/w/index.php?title=American_Mathematical_Monthly&amp;action=edit&amp;redlink=1" class="new" title="American Mathematical Monthly (page does not exist)">American Mathematical Monthly</a></cite><sup><a rel="nofollow" class="external autonumber" href="http://jstor.org/stable/2319844">[2]</a></sup>, volume 82, issue 3, Mathematical Association of America, <small><a href="https://en.wikipedia.org/wiki/Digital_object_identifier" class="extiw" title="w:Digital object identifier">DOI</a>:<span class="neverexpand"><a rel="nofollow" class="external text" href="https://dx.doi.org/10.2307%2F2319844">10.2307/2319844</a></span></small>, pages 221–239.
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