@article{GDZPPN002312549,
title = {A Commutativity Theorem for Hermitian Operators.},
journal = {Mathematische Annalen},
volume = {219},
year = {1976},
pages = {215-218},
zbl = {0305.47014},
url = {http://dml.mathdoc.fr/item/GDZPPN002312549}
}
Dowson, H.R.; Gillespie, T.A.; Spain, P.G. A Commutativity Theorem for Hermitian Operators.. Mathematische Annalen, Tome 219 (1976) pp. 215-218. http://gdmltest.u-ga.fr/item/GDZPPN002312549/