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In:
Frolík, Zdeněk (ed.): Proceedings of the 10th Winter School on Abstract Analysis.
Circolo Matematico di Palermo, Palermo, 1982.
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de Vries, Jan: On the existence of G-compactifications.
(English).
In:
Frolík, Z. (ed.): Abstracta. 7th Winter School on Abstract Analysis.
Czechoslovak Academy of Sciences, Praha, 1979.
pp. 92-94