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In the study of various important and difficult problems in graph theory (such as the cycle double cover conjecture and the 5-flow conjecture), one encounters an interesting but somewhat mysterious variety of graphs called snarks. In spite of their simple definition...and over a century long investigation, their properties and structure are largely unknown. Siehe Miroslav Chladný, Martin Škoviera: Factorisation of snarks. In: Electronic Journal of Combinatorics. Band17, 2010, S.R32, doi:10.37236/304.
Sarah-Marie Belcastro: The continuing saga of snarks. In: The College Mathematics Journal. Band43, Nr.1, 2012, S.82–87, doi:10.4169/college.math.j.43.1.082.
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Martin Gardner: Snarks, boojums, and other conjectures related to the four-color-map theorem. In: Scientific American. Band234, Nr.4, 1976, S.126–130, doi:10.1038/scientificamerican0476-126, JSTOR:24950334.
