@article{PORMA_1942__3_2_114601,
     author = {Bohnenblust, Frederic},
     title = {A characterization of complex {Hilbert} spaces},
     journal = {Portugaliae mathematica},
     pages = {103--109},
     publisher = {mathdoc},
     volume = {3},
     number = {2},
     year = {1942},
     mrnumber = {0008117},
     zbl = {0026.32403},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1942__3_2_114601/}
}