@article{GDZPPN002382652, title = {Note on a Theorem of Banach.}, journal = {Mathematische Zeitschrift}, volume = {55}, year = {1951}, pages = {308-309}, zbl = {0047.28505}, url = {http://dml.mathdoc.fr/item/GDZPPN002382652} }
Fan, Ky. Note on a Theorem of Banach.. Mathematische Zeitschrift, Tome 55 (1951) pp. 308-309. http://gdmltest.u-ga.fr/item/GDZPPN002382652/