@article{GDZPPN002222922, title = {On the Spherical Spectrum.}, journal = {Manuscripta mathematica}, volume = {31}, year = {1980}, pages = {137-148}, zbl = {0455.47021}, url = {http://dml.mathdoc.fr/item/GDZPPN002222922} }
Nieto, Jose I. On the Spherical Spectrum.. Manuscripta mathematica, Tome 31 (1980) pp. 137-148. http://gdmltest.u-ga.fr/item/GDZPPN002222922/