@article{700872,
     title = {On finite $T\_0$-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 = {1967},
     pages = {115-117},
     mrnumber = {MR0240768},
     zbl = {0157.53202},
     url = {http://dml.mathdoc.fr/item/700872}
}

Doyle, P. H. On finite $T_0$-spaces, dans General Topology and its Relations to Modern Analysis and Algebra, GDML_Books,  (1967), pp. 115-117. http://gdmltest.u-ga.fr/item/700872/