1. Cycle-saturated graphs of minimum size;Barefoot;Discrete Math.,1990
2. Modern Graph Theory;Bollobás,1998
3. On a Ramsey–Turán type problem;Bollobás;J. Combin. Theory B,1976
4. On sequences of integers no one of which divides the product of two others and some related problems;Erdös;Mitt. Forschungsinst. Math. u. Mech. Tomsk,1938
5. A problem in graph theory;Erdös;Amer. Math. Monthly,1964