A theorem on Banach spaces
Kober, H.
Compositio Mathematica, Tome 7 (1940), p. 135-140 / Harvested from Numdam
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@article{CM_1940__7__135_0,
     author = {Kober, H.},
     title = {A theorem on Banach spaces},
     journal = {Compositio Mathematica},
     volume = {7},
     year = {1940},
     pages = {135-140},
     zbl = {0022.05401},
     language = {en},
     url = {http://dml.mathdoc.fr/item/CM_1940__7__135_0}
}

Kober, H. A theorem on Banach spaces. Compositio Mathematica, Tome 7 (1940) pp. 135-140. http://gdmltest.u-ga.fr/item/CM_1940__7__135_0/