@article{GDZPPN002313421, title = {Spectrum and the Fixed Point Sets of Isometries. I.}, journal = {Mathematische Annalen}, volume = {219}, year = {1976}, pages = {161-170}, zbl = {0319.53031}, url = {http://dml.mathdoc.fr/item/GDZPPN002313421} }
Donnelly, Harold. Spectrum and the Fixed Point Sets of Isometries. I.. Mathematische Annalen, Tome 219 (1976) pp. 161-170. http://gdmltest.u-ga.fr/item/GDZPPN002313421/