@article{GDZPPN002340100,
title = {Powers and commutativity of selfadjoint operators.},
journal = {Mathematische Annalen},
volume = {300},
year = {1994},
pages = {643-648},
zbl = {0839.47015},
url = {http://dml.mathdoc.fr/item/GDZPPN002340100}
}
Uchiyama, Mitsuru. Powers and commutativity of selfadjoint operators.. Mathematische Annalen, Tome 300 (1994) pp. 643-648. http://gdmltest.u-ga.fr/item/GDZPPN002340100/