References
- N. Aoki, Topics in General Topology, Elsevier, Amsterdaml, 1989.
- K. Haddad and W. Ott, Recurrence in pairs, Ergod. Th. and Dynam. Sys. 28 (2008), 1135-1143.
- K. Koo, Recurrence and zero characteristic properties in dynamical systems, Ph. D. Thesis, (1988).
- N. P. Bhatia and G. P. Szego, Dynamical systems: Stability Theory and Applications, Springer-Verlag, Berlin, 1967.