@article{MAN_1967__170_161531,
     author = {W. Meyer},
     title = {Kritische {Mannigfaltigkeiten} in {Hilbertmannigfaltigkeiten.}},
     journal = {Mathematische Annalen},
     pages = {45--66},
     publisher = {mathdoc},
     volume = {170},
     year = {1967},
     zbl = {0142.21604},
     url = {http://geodesic.mathdoc.fr/item/MAN_1967__170_161531/}
}