@article{MAN_1906__62_158257,
     author = {Edmund Landau},
     title = {\"Uber die {Darstellung} definiter {Funktionen} durch {Quadrate}},
     journal = {Mathematische Annalen},
     pages = {272--285},
     publisher = {mathdoc},
     volume = {62},
     year = {1906},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MAN_1906__62_158257/}
}