@article{700570,
     title = {Some base axioms for topology involving enumerability},
     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 = {1971},
     pages = {[55]-61},
     mrnumber = {MR0287508},
     zbl = {0226.54016},
     url = {http://dml.mathdoc.fr/item/700570}
}

Aull, C. E. Some base axioms for topology involving enumerability, dans General Topology and Its Relations to Modern Analysis and Algebra, GDML_Books,  (1971), pp. [55]-61. http://gdmltest.u-ga.fr/item/700570/