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2. Isolated invariant sets ans isolated blocks;Conley;Transactions of the AMS,1971
3. Lectures on Algebraic Topology;Dold,1972
4. Homotopy invariants of repeller–attractor pairs. I;Kurland;Journal of Differential Equations,1982
5. The connection map for attractor–repeller pairs;McCord;Transactions of the AMS,1988