04-40
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Frolík, Zdeněk:
A note on the Souslin operations.
(English).
Commentationes Mathematicae Universitatis Carolinae,
vol. 9
(1968),
issue 4,
pp. 641-650
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Frolík, Zdeněk:
On $B$-spaces.
(English).
Commentationes Mathematicae Universitatis Carolinae,
vol. 9
(1968),
issue 4,
pp. 651-658
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