1. Claw-decompositions and Tutte-orientations;Barát;J. Graph Theory,2006
2. C. Berge, in: Théorie des Graph by C. Berge, Paris, 1958, p. 80.
3. Graph Theory;Bondy,2008
4. Double cycle covers and the Petersen graph;Catlin;J. Graph Theory,1989
5. U.A. Celmins, On cubic graphs that do not have an edge 3-coloring, PhD thesis, University of Waterloo, Waterloo, Canada, 1984.