1. Fulkerson’s conjecture and circuit covers;Fan;J. Combin. Theory Ser. B,1994
2. Blocking and anti-blocking pairs of polyhedra;Fulkerson;Math. Program.,1971
3. The NP-completeness of edge-coloring;Holyer;SIAM J. Comput.,1981
4. Unions of Perfect Matching in Cubic Graphs, Topics in Discrete Mathematics;Kaiser,2006
5. G. Mazzuoccolo, Covering a cubic graph with perfect matchings, Nov 2011. arXiv:1111.1871v2.