[1] Dow A.:
An introduction to applications of elementary submodels to topology. Prepгint no 88-04, York Univ.
Zbl 0696.03024
[2] Juhász L., Mrówka S.:
$E$-compactness and the Alexandrov duplicate. Indag. Math. 32 (1970), 26-29.
MR 0259862
[4] Malychin V.:
Bikompakt Fréchet-Urysona bez toček... Mat. Zametki 41 (1987), 365-376.
MR 0893365
[5] Ostaszewski A.:
On countably compact, perfectly normal spaces. J. London Math. Soc. 14 (1976), 505-516.
MR 0438292 |
Zbl 0348.54014
[6] Šapirovskii B.: On the tightness, $\pi $-weight and related notions... Uč. Zap. Latv. Univ. 257 (1976), 88-89. (in Russian).