@article{GDZPPN00203901X, title = {Unitary similarity of projectors.}, journal = {Aequationes mathematicae}, volume = {41}, year = {1991}, pages = {220-224}, zbl = {0749.15005}, url = {http://dml.mathdoc.fr/item/GDZPPN00203901X} }
Dokovic, Dragomir Z. Unitary similarity of projectors.. Aequationes mathematicae, Tome 41 (1991) pp. 220-224. http://gdmltest.u-ga.fr/item/GDZPPN00203901X/