Šalát, T.: Normale Zahlen und Bairesche Kategorien von Mengen.
(German) [Normal numbers and Baire categories of sets].
In:
General Topology and its Relations to Modern Analysis and Algebra.
Proceedings of the second Prague topological symposium, 1966.
Academia Publishing House of the Czechoslovak Academy of Sciences, Praha, 1967.
pp. 306-307