1. , and , Hamiltonian properties of graphs with large neighborhood unions. Preprint (1989).
2. Longest paths and cycles in graphs of high degree. Research report CORR80-16, Department of Combinatorics and Optimization, University of Waterloo, Waterloo, Ontario, Canada (1980).
3. and , Graph Theory with Applications. Macmillan, London, and Elsevier, New York (1976).
4. , , and , Neighborhood unions and a generalization of Dirac's Theorem. Preprint (1988).
5. , , and , Neighborhood unions and highly hamiltonian graphs. Preprint (1988).