[1] M. Behzad G. Chartrand, and L. Lesniak-Foster: Graphs & Digraphs. Prindle, Weber & Schmidt, Boston 1979. MR 0525578

[2] С Berge: Graphs and Hypergraphs. North-Holland, Amsterdam, London 1973. Zbl 0254.05101

[3] G. Chartrand A. D. Polimeni, and M. J. Stewart: The existence of l-factors in line graphs, squares, and total graphs. Indag. Math. 35 (1973), 228-232. DOI 10.1016/1385-7258(73)90007-3 | MR 0321809

[4] F. Harary: Graph Theory. Addison-Wesley, Reading (Mass.) 1969. MR 0256911 | Zbl 0196.27202

[5] L. Nebesky: On the existence of a 3-factor in the fourth power of a graph. Časopis pěst. mat. 105 (1980), 204-207. MR 0573113 | Zbl 0433.05046

[6] L. Nebeský, E. Wisztová: Regular factors in powers of connected graphs. Časopis pěst. mat. 106 (1981), 52-57. MR 0613706

[7] M. Sekanina: On an ordering of the set of vertices of a connected graph. Publ. Sci. Univ. Brno 142 (1960), 137-142. MR 0140095 | Zbl 0118.18903

[8] D. P. Sumner: Graphs with l-factors. Proc. Amer. Math. Soc. 42 (1974), 8-12. MR 0323648