Engelking, R.: Quelques démonstrations nouvelles dans la théorie des ensembles boreliens.
(French) [Some new proofs in the theory of Borel 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. 131-132
