1. Graph Theory with Applications;Bondy,1976
2. S. Brandt, A note on D3-cycles, manuscript, 1995.
3. Some theorems on abstract graphs;Dirac;Proc. London Math. Soc.,1952
4. Long paths and large cycles in finite graphs;Enomoto;J. Graph Theory,1984
5. Longest cycles in graphs with moderate connectivity;Jung,1990