On positive integers representable as a sum of three squares
Journées arithmétiques de Besançon, Astérisque no. 147-148  (1987), p. 259-263
@incollection{AST_1987__147-148__259_0,
     author = {Arenas, Angela},
     title = {On positive integers representable as a sum of three squares},
     booktitle = {Journ\'ees arithm\'etiques de Besan\c con},
     author = {Collectif},
     series = {Ast\'erisque},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {147-148},
     year = {1987},
     pages = {259-263},
     zbl = {0623.10034},
     language = {en},
     url = {http://www.numdam.org/item/AST_1987__147-148__259_0}
}
Arenas, Angela. On positive integers representable as a sum of three squares, in Journées arithmétiques de Besançon, Astérisque, no. 147-148 (1987), pp. 259-263. http://www.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. | Article | Zbl 0533.10021

[3] C. L. Siegel : Über die analytische Theorie der quadratischen Formen. Ann. of Math. 36 (1935), 527-606. Gesammelte Abhand., Band 1. Springer, 1966. | Article | JFM 61.0140.01 | Zbl 0012.19703

[4] N. Vila : On central extensions of A n as a Galois group over 𝐐. Arch. Math., vol. 44, (1985), 424-437. | Article | Zbl 0562.12011