@article{1102991872,
author = {Riddell, R. C.},
title = {Spectral concentration for self-adjoint operators.},
journal = {Pacific J. Math.},
volume = {23},
number = {3},
year = {1967},
pages = { 377-401},
language = {en},
url = {http://dml.mathdoc.fr/item/1102991872}
}
Riddell, R. C. Spectral concentration for self-adjoint operators.. Pacific J. Math., Tome 23 (1967) no. 3, pp. 377-401. http://gdmltest.u-ga.fr/item/1102991872/