1. Graphs and Hypergraphs;Berge,1973
2. The Computational Complexity of Algebraic and Numeric Problems;Borodin,1975
3. Matrix tree theorems;Chaiken;J. Combinatorial Theory Ser. A,1978
4. The complexity of control structures and data structures;De Millo;Proc. 7th ACM Symposium on Theory of Computing,1975
5. The complexity of negation-limited networks;Fischer,1975