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Mrowka, S.; Tan, H. P. Sequences of disjoint open sets. (English) Zbl 0246.54027 Czech. Math. J. 22(97), 517-521 (1972). MSC: 54D99 54D10 PDFBibTeX XMLCite \textit{S. Mrowka} and \textit{H. P. Tan}, Czech. Math. J. 22(97), 517--521 (1972; Zbl 0246.54027) Full Text: EuDML