@article{700931,
     title = {A contribution to the descriptive theory of sets and spaces},
     booktitle = {General Topology and its Relations to Modern Analysis and Algebra},
     series = {GDML\_Books},
     publisher = {Academia Publishing House of the Czechoslovak Academy of Sciences},
     address = {Praha},
     year = {1962},
     pages = {[157]-173},
     mrnumber = {MR0145471},
     zbl = {0116.14202},
     url = {http://dml.mathdoc.fr/item/700931}
}

Frolík, Z. A contribution to the descriptive theory of sets and spaces, dans General Topology and its Relations to Modern Analysis and Algebra, GDML_Books,  (1962), pp. [157]-173. http://gdmltest.u-ga.fr/item/700931/