@article{NGWGMP_1919__1919_59061,
     author = {E. Landau},
     title = {\"Uber die {Zerlegung} total positiver {Zahlen} in {Quadrate}},
     journal = {Nachrichten von der Gesellschaft der Wissenschaften zu G\"ottingen, Mathematisch-Physikalische Klasse},
     pages = {392--396},
     publisher = {mathdoc},
     volume = {1919},
     year = {1919},
     zbl = {47.0161.01},
     url = {http://geodesic.mathdoc.fr/item/NGWGMP_1919__1919_59061/}
}