Borel sets with $F_σδ$-section

Instytut Matematyczny Polskiej Akademii Nauk / Institute of Mathematics / Publishing house / Journals and Serials / Fundamenta Mathematicae / All issues

J. Bourgain Fundamenta Mathematicae 107 (1980), 149-159 DOI: 10.4064/fm-107-2-149-159