1. Andersen, L.D.: On edge-colourings of graphs. Math. Scand.,40, 161–175 (1977)
2. Behzad, M., Chartrand, G.: Introduction to the Theory of Graphs. Allyn and Bacon 1971
3. Bollobás, B.: Extremal Graph Theory. London: Academic Press, 1978
4. Chetwynd, A.G., Hilton, A.J.W.: Partial edge-colourings of complete graphs or of graphs which are nearly complete. In: Graph Theory and Combinatorics (Proc. of the Cambridge Combinatorial Conference in Honour of Paul Erdös, edited by B. Bollobás), pp. 81–98. London: Academic Press 1984
5. Chetwynd, A.G., Hilton, A.J.W.: The chromatic index of graphs of even order with many edges. J. Graph Theory,8, 463–470 (1984)