@article{CM_1940__7__372_0,
author = {Sidon, S.},
title = {\"Uber Orthogonalsysteme},
journal = {Compositio Mathematica},
volume = {7},
year = {1940},
pages = {372-375},
mrnumber = {1995},
zbl = {0023.02503},
language = {de},
url = {http://dml.mathdoc.fr/item/CM_1940__7__372_0}
}
Sidon, S. Über Orthogonalsysteme. Compositio Mathematica, Tome 7 (1940) pp. 372-375. http://gdmltest.u-ga.fr/item/CM_1940__7__372_0/