@article{700972,
     title = {Mazur's theorem},
     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 = {1962},
     pages = {[221]-225},
     mrnumber = {MR0151833},
     zbl = {0117.07802},
     url = {http://dml.mathdoc.fr/item/700972}
}

Isbell, J. R. Mazur's theorem, dans General Topology and its Relations to Modern Analysis and Algebra, GDML_Books,  (1962), pp. [221]-225. http://gdmltest.u-ga.fr/item/700972/