1. A new evaluation function for approximation algorithm;Aiello;Sem. IRIA,1977
2. On the structure of combinatorial problems and structure preserving reductions;Ausiello,1977
3. Classes of structurally isomorphic NP-optimization problems;Ausiello,1977
4. On polynomial time isomorphisms of complete sets;Berman,1977
5. The complexity of theorems proving procedures;Cook,1971