@article{1178242810, author = {Behncke, Horst}, title = {Projections in Hilbert space}, journal = {Tohoku Math. J. (2)}, volume = {22}, number = {4}, year = {1970}, pages = { 181-183}, language = {en}, url = {http://dml.mathdoc.fr/item/1178242810} }
Behncke, Horst. Projections in Hilbert space. Tohoku Math. J. (2), Tome 22 (1970) no. 4, pp. 181-183. http://gdmltest.u-ga.fr/item/1178242810/