Błaszczyk, Aleksander; Szymański, Andrzej Hausdorff’s gaps versus normality. (English) Zbl 0526.54002 Bull. Acad. Pol. Sci., Sér. Sci. Math. 30, 371-378 (1982). MSC: 54A25 54D40 54D15 54G15 03E20 PDFBibTeX XMLCite \textit{A. Błaszczyk} and \textit{A. Szymański}, Bull. Acad. Pol. Sci., Sér. Sci. Math. 30, 371--378 (1982; Zbl 0526.54002)
Błaszczyk, Aleksander; Szymański, Andrzej Concerning Parovicenko’s theorem. (English) Zbl 0473.54014 Bull. Acad. Pol. Sci., Sér. Sci. Math. 28, 311-314 (1980). MSC: 54D30 54A25 PDFBibTeX XMLCite \textit{A. Błaszczyk} and \textit{A. Szymański}, Bull. Acad. Pol. Sci., Sér. Sci. Math. 28, 311--314 (1980; Zbl 0473.54014)