@article{GDZPPN002470071,
title = {Symmetric Linear Operators on a Banach Space.},
journal = {Monatshefte f\"ur Mathematik},
volume = {53},
year = {1949},
pages = {278-297},
zbl = {0035.35901},
url = {http://dml.mathdoc.fr/item/GDZPPN002470071}
}
Atkinson, F.V. Symmetric Linear Operators on a Banach Space.. Monatshefte für Mathematik, Tome 53 (1949) pp. 278-297. http://gdmltest.u-ga.fr/item/GDZPPN002470071/