1. Isomorphisms and 1-L reductions;Allender,1986
2. Polynomial Reducibilities and Complete Sets;Berman,1977
3. On isomorphism and density of NP and other complete sets;Berman;SIAM J. Comput.,1977
4. Relationship between density and deterministic complexity of NP-complete languages;Berman,1978
5. Crusade for a better notation;Brassard;SIGACT News,1985