1. Snarks and Supersnarks;Chetwynd,1981
2. An equivalent version of the 3-flow conjecture;Kochol;Journal of Combinatorial Theory, Series B,2001
3. Tutte's edge colouring conjecture;Robertson;Journal of Combinatorial Theory B,1997
4. Nowhere-zero flows;Seymour,1995
5. Grötzsch's Theorem for the projective plane;Steinberg;Ars Combinatoria,1989