Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{CMH_1969__44_139386, author = {E. Ogg}, title = {Ein {Satz} \"uber orthogonal abgeschlossene {Unterr\"aume.}}, journal = {Commentarii mathematici Helvetici}, pages = {117--119}, publisher = {mathdoc}, volume = {44}, year = {1969}, zbl = {0258.15014}, url = {http://geodesic.mathdoc.fr/item/CMH_1969__44_139386/} }
E. Ogg. Ein Satz über orthogonal abgeschlossene Unterräume.. Commentarii mathematici Helvetici, Tome 44 (1969), pp. 117-119. http://geodesic.mathdoc.fr/item/CMH_1969__44_139386/