@article{MZ_1957__67_169648,
     author = {Elmar Thoma},
     title = {Zur {Reduktionstheorie} in sparablen {Hilbert-R\"aumen.}},
     journal = {Mathematische Zeitschrift},
     pages = {1--9},
     publisher = {mathdoc},
     volume = {67},
     year = {1957},
     zbl = {0077.10505},
     url = {http://geodesic.mathdoc.fr/item/MZ_1957__67_169648/}
}