@article{GDZPPN00235098X,
title = {On the Fine Structure of Spectra.},
journal = {Mathematica Scandinavica},
volume = {28},
year = {1971},
pages = {37-49},
zbl = {0236.47006},
url = {http://dml.mathdoc.fr/item/GDZPPN00235098X}
}
Halberg, C.J.A., Jr.; Samuelsson, A. On the Fine Structure of Spectra.. Mathematica Scandinavica, Tome 28 (1971) pp. 37-49. http://gdmltest.u-ga.fr/item/GDZPPN00235098X/