1. Tough graphs and hamiltonian circuits
2. Bermond, J.C. (1978) Hamiltonian Graphs. In: Beineke, L. and Wilson, R.J., Eds., Seleted Topics in Graph Theorey, Academic Press, London, 127-167.
3. Chordality and 2-factors in tough graphs
4. 10-tough chordal graphs are Hamiltonian
5. Toughness, hamiltonicity and split graphs