Counterexamples to a conjecture about Petersen-minors in supersnarks

Abstract In this note counterexamples to a conjecture of Chetwynd and Wilson (Snarks and supersnarks, in: Chartrand et al. (Eds.), The Theory and Applications of Graphs. (Kalamazoo, MI, 1980), Wiley, New York, 1981, pp. 215–241) are constructed.