1. Alternating cycles and trails in 2-edge-coloured complete multigraphs;Bang-Jensen;Discrete Math.,1998
2. Digraphs: Theory, Algorithms, Applications, Monographs in Mathematics;Bang-Jensen,2000
3. R. Diestel, Graph theory, 2nd Edition, Graduate Texts in Mathematics, Vol. 173, Springer, New York, 2000.
4. H. Fleischner, personal communication.
5. H. Fleischner, Eulerian Graphs and Related Topics, Part 1, Vol. 1, Annals of Discrete Mathematics, Vol. 45, Elsevier Science Publishers, North-Holland, Amsterdam, 1990.