1. Isolated Invariant Sets and the Morse Index;Conley,1978
2. Lectures on Algebraic Topology;Dold,1967
3. A refinement of the Conley index and an application to the stability of hyperbolic invariant sets;Floer;Ergodic Theory Dynam. Syst.,1987
4. Lectures on Algebraic Topology;Greenberg,1980
5. Homology and Cohomology Theory. An Approach Based on Alexander–Spanier Cochains;Massey,1978