@article{700818,
     title = {Two theorems of the descriptive theory of point sets},
     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 = {1967},
     pages = {283-283},
     zbl = {0161.42403},
     url = {http://dml.mathdoc.fr/item/700818}
}

Ponomarev, V. Two theorems of the descriptive theory of point sets, dans General Topology and its Relations to Modern Analysis and Algebra, GDML_Books,  (1967), p. 283. http://gdmltest.u-ga.fr/item/700818/