@article{700820,
     title = {Abgeschw\"achte Trennungsaxiome},
     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 = {103-104},
     zbl = {0171.43402},
     url = {http://dml.mathdoc.fr/item/700820}
}

Császár, K. Abgeschwächte Trennungsaxiome, dans General Topology and its Relations to Modern Analysis and Algebra, GDML_Books,  (1967), pp. 103-104. http://gdmltest.u-ga.fr/item/700820/