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@article{PMF_1937_45_1_a4, author = {Estermann, T.}, title = {On the representations of a number as a sum of squares}, journal = {Prace Matematyczno-Fizyczne}, pages = {93--125}, publisher = {mathdoc}, volume = {45}, number = {1}, year = {1937}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PMF_1937_45_1_a4/} }
Estermann, T. On the representations of a number as a sum of squares. Prace Matematyczno-Fizyczne, Tome 45 (1937) no. 1, pp. 93-125. http://geodesic.mathdoc.fr/item/PMF_1937_45_1_a4/