@article{GDZPPN002192187,
title = {A unitary invariant for pairs of self-adjoint operators.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {281},
year = {1976},
pages = {294-312},
zbl = {0348.47013},
url = {http://dml.mathdoc.fr/item/GDZPPN002192187}
}
Carey, Richard W. A unitary invariant for pairs of self-adjoint operators.. Journal für die reine und angewandte Mathematik, Tome 281 (1976) pp. 294-312. http://gdmltest.u-ga.fr/item/GDZPPN002192187/