1. G. Chen, R.J. Faudree, Z. Hu, J. Ma, L. Soˇltés, Path spectra for trees (preprint).
2. Non-path spectrum sets;Chen;J. Graph Theory,2008
3. Tough graphs and hamiltonian circuits;Chvátal;Discrete Math.,1973
4. Some theorems on abstract graphs;Dirac;Proc. Lond. Math. Soc. (3),1952
5. Proof techniques for factor theorems;Egawa,2008