1. Martin's axiom and first-countable S- and L-spaces;Abraham,1984
2. Remark on the concept of compactness;Arens;Portugalieae Math.,1950
3. D-spaces and covering properties;Arhangel'skiĭ;Topol. Appl.,2005
4. Addition theorems and D-spaces;Arhangel'skiĭ;Comment. Math. Univ. Carol.,2002
5. Group radicals and strongly compact cardinals;Bagaria;Trans. Am. Math. Soc.,2014