1. Dow A.: An introduction to applications of elementary submodels to topology. Topology Proceedings. 13, 17–72 (1988)
2. Fleissner W.: Left-separated spaces with point-countable bases. Trans. Amer. Math. Soc., 294, 665–677 (1986)
3. Hajnal A., Juhász I.: Subspaces of topological spaces. Indag.Math., 29, 343–356 (1967)
4. D. T. Soukup, Davies-trees in infinite combinatorics,
arxiv:1407.3604v1
, (2014), 8 pp.
5. L. Soukup and A. Stanley, Left separated topological spaces (submitted).