1. L Caccetta and K Vijayan, Applications of graph theory,inFourteenth Australasian Conference on Combinatorial Mathematics and Computing, (Dunedin, 1986); Ars Combin., Vol. 23, pp. 21–77, 1987.
2. F S Roberts, Graph Theory and its Applications to the Problems of Society,CBMS-NSF Monograph 29, SIAM Publications, Philadelphia, 1978.
3. L Lovasz, L Pyber, D J A Welsh, and G M Ziegler, Combinatorics in pure mathematics, inHandbook of Combinatorics, Editors: R L Graham, M Grotschel and L Lovasz, Elsevier Science BV, Amsterdam, 1996.
4. D Konig, Theorie der endlichen und unendlichen Graphen,AkademischeVerlagsgesellschaft, Leipzig, 1936; reprinted by Chelsea, New York, 1950.
5. K Heinrich and P Horak, Euler’s Theorem,American Mathematical Monthly, Vol.101, p. 260, 1994.