1. R. B. Allan and R. Laskar, On domination and independent domination numbers of a graph, preprint.
2. 1-Factors and antifactor sets;Sumner;J. London Math. Soc.,1976
3. W. T. Trotter, personal communication.
4. The factorization of linear graphs;Tutte;J. London Math. Soc. (2),1947