@article{MAN_1934__109_159678,
     author = {K. Friedrichs},
     title = {Die {Grenzreziproke} positiv definiter unendlicher {Matrizen.} {Neuer} {Beweis} des {Satzes} von {Toeplitz}},
     journal = {Mathematische Annalen},
     pages = {254--256},
     publisher = {mathdoc},
     volume = {109},
     year = {1934},
     zbl = {0008.11703},
     url = {http://geodesic.mathdoc.fr/item/MAN_1934__109_159678/}
}