@article{bwmeta1.element.bwnjournal-article-smv38i1p22bwm,
author = {Joel Cohen},
title = {A characterization of inner product spaces using absolutely 2-summing operators},
journal = {Studia Mathematica},
volume = {34},
year = {1970},
pages = {271-276},
zbl = {0203.43301},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-smv38i1p22bwm}
}
Cohen, Joel. A characterization of inner product spaces using absolutely 2-summing operators. Studia Mathematica, Tome 34 (1970) pp. 271-276. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-smv38i1p22bwm/