@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/