@article{GDZPPN002343428,
title = {Periodizit\"atseigenschaften unit\"ater Gruppen in Hilbertr\"aumen.},
journal = {Mathematica Scandinavica},
volume = {2},
year = {1954},
pages = {334-344},
zbl = {0057.06802},
url = {http://dml.mathdoc.fr/item/GDZPPN002343428}
}
Maak, Wilhelm. Periodizitätseigenschaften unitäter Gruppen in Hilberträumen.. Mathematica Scandinavica, Tome 2 (1954) pp. 334-344. http://gdmltest.u-ga.fr/item/GDZPPN002343428/