@article {LutMayCVKL,
	title = {Cook versus Karp Levin Separating Completeness Notions If NP Is Not Small},
	journal = {Theoretical Computer Science},
	volume = {164},
	year = {1996},
	pages = {141-163},
	url = {http://webdiis.unizar.es/\%7Eelvira/publicaciones/cvkl.ps.gz},
	author = {J.H. Lutz and E. Mayordomo}
}

