@article{MZ_1950__53_169181,
     author = {G. K\"othe},
     title = {\"Uber zwei {S\"atze} von {Banach}},
     journal = {Mathematische Zeitschrift},
     pages = {203--209},
     publisher = {mathdoc},
     volume = {53},
     year = {1950},
     url = {http://geodesic.mathdoc.fr/item/MZ_1950__53_169181/}
}