1. It is hard to know when greedy is good for finding independent sets;Bodlaender;Inform. Process. Lett.,1997
2. Computers and Intractability: A Guide to the Theory of NP-Completeness;Garey,1979
3. Greed is good: Approximating independent sets in sparse and bounded-degree graphs;Halldorsson,1994
4. Recognizing when greed can approximate maximum independent sets is complete for parallel access to NP;Hemaspaandra,1997
5. The polynomial time hierarchy collapses if the boolean hierarchy collapses;Kadin;SIAM J. Comput.,1988