@article{700590,
     title = {A new metrization proof},
     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 = {[127]-130},
     mrnumber = {MR0283757},
     zbl = {0226.54028},
     url = {http://dml.mathdoc.fr/item/700590}
}

Franklin, S. P. A new metrization proof, dans General Topology and Its Relations to Modern Analysis and Algebra, GDML_Books,  (1971), pp. [127]-130. http://gdmltest.u-ga.fr/item/700590/