1. R.K. Ahuja, T.L. Magnanti, J.B. Orlin, Network Flows, Prentice-Hall, Englewood Cliffs, NJ, 1993
2. Algorithm for finding optimum trees: Description, use and evaluation;Camerini;Annals of Operations Research,1988
3. Collected papers;Cayley;Quarterly Journal of Mathematics,1987
4. Computer generation of directed trees and complete trees;Chen;International Journal of Electronics,1973
5. Efficient spanning trees;Corley;Journal of Optimization Theory and Applications,1985