@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/