On positive integers representable as a sum of three squares
Journées arithmétiques de Besançon, Astérisque, no. 147-148 (1987), pp. 259-263. 
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     author = {Arenas, Angela},
     title = {On positive integers representable as a sum of three squares},
     booktitle = {Journ\'ees arithm\'etiques de Besan\c{c}on},
     series = {Ast\'erisque},
     pages = {259--263},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {147-148},
     year = {1987},
     zbl = {0623.10034},
     language = {en},
     url = {http://archive.numdam.org/item/AST_1987__147-148__259_0/}
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Arenas, Angela. On positive integers representable as a sum of three squares, dans Journées arithmétiques de Besançon, Astérisque, no. 147-148 (1987), pp. 259-263. http://archive.numdam.org/item/AST_1987__147-148__259_0/

[1] A. Arenas Solá : Un problema aritmético sobre las sumas de tres cuadrados. Tesis doctoral. Universidad de Barcelona (1985).

[2] R. Schulze-Pillot : Thetareihen positiv definiter quadratischer Formen. Inv. Math. 75. (1984), 283-299. | DOI | EuDML | Zbl

[3] C. L. Siegel : Über die analytische Theorie der quadratischen Formen. Ann. of Math. 36 (1935), 527-606. Gesammelte Abhand., Band 1. Springer, 1966. | DOI | JFM | Zbl

[4] N. Vila : On central extensions of A n as a Galois group over 𝐐. Arch. Math., vol. 44, (1985), 424-437. | DOI | Zbl