References
- N. Aoki, Topological Dynamics, Elsevier Sci. Pub., Tokyo, 1989.
- N. Bhatia and G. Szego, Dynamical Systems: Stability Theory and Applications, Springer-Verlag, Berlin, 1967.
- R. Knight, Unstable Weak Attractors, Proc. Amer. Math. Soc., 86 (1982), 586-590. https://doi.org/10.1090/S0002-9939-1982-0674085-0
- R. Knight, Zubov's Condition Revisited, Proc. Edinburgh Math. Soc., 26 (1983), 247-253. https://doi.org/10.1017/S0013091500016953
- K. Koo, On the flows near closed sets, Natural Sci., 23 (2012), 169-173.
- K. Koo, Characterization of flows near closed sets, J. Chungcheong Math. Soc., 29 (2016), 23-28. https://doi.org/10.14403/jcms.2016.29.1.23