@article{10_4064_aa_42_1_11_20,
     author = {Franz Halter-Koch},
     title = {Darstellung nat\"urlicher {Zahlen} als {Summe} von {Quadraten}},
     journal = {Acta Arithmetica},
     pages = {11--20},
     publisher = {mathdoc},
     volume = {42},
     number = {1},
     year = {1982},
     doi = {10.4064/aa-42-1-11-20},
     language = {de},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-42-1-11-20/}
}