References
- A. Arhangel’skii, A theorem on cardinality, Russian Math. Surveys 34 (1979), 153–154. doi: 10.1070/RM1979v034n04ABEH002968
- R. Engelking, General Topology, Revised and completed edition, Heldermann Verlag, Berlin, 1989.
- Z. Frolik, Generalizations of compact and Lindelöf spaces, Czech. Math. J. 9(84) (1959), 172–217.
- S. Mrówka, On completely regular spaces, Fund. Math. 41 (1954), 105–106.
- Y.-K. Song and H.-Y. Zhao, Some remarks on almost Lindelöf spaces and weakly Lindelöf spaces, Mat. Vesnik 6(1) (2010), 77–83.
- P. Staynova, A comparison of Lindelöf-type covering properties of topological spaces, Rose-Hulman Undergraduate Mathematics Journal 12(2) (2011), 163–204.
- P. Staynova, A note on quasi-Lindelöf spaces, 2012, arXiv:1212.2869v1 [math.GN].
- S. Willard and U.N.B. Dissanayake, The almost Lindelöf degree, Canad. Math. Bull. 27(4) (1984), 452–455. doi: 10.4153/CMB-1984-070-2