1. On invariant sets;Beck;Ann. of Math. (2),1958
2. Stability Theory of Dynamical Systems;Bhatia,1970
3. On the structure of attracting compacta;Bogatyi;Differ. Uravn.,1989
4. Concerning homotopy properties of compacta;Borsuk;Fund. Math.,1968
5. On the concept of shape for metrizable spaces;Borsuk;Bull. Acad. Polon. Sci.,1970