Harary, F. "Covering and Packing in Graphs, I." Ann. New York Acad. Sci.175, 198-205, 1970.Harary, F.
"Arboricity." In Graph
Theory. Reading, MA: Addison-Wesley, pp. 90-92, 1994.Harary,
F. and Palmer, E. M. Graphical
Enumeration. New York: Academic Press, p. 225, 1973.Harary,
F. and Palmer, E. M. "A Survey of Graph Enumeration Problems." In
A Survey of Combinatorial Theory (Ed. J. N. Srivastava). Amsterdam:
North-Holland, pp. 259-275, 1973.Nash-Williams, C. St. J. A.
"Edge-Disjoint Spanning Trees of Finite Graphs." J. London Math. Soc.36,
455-450, 1961.