On positive integers representable as a sum of three squares
Journées arithmétiques de Besançon, Astérisque, no. 147-148 (1987), 5 p.
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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},
     author = {Collectif},
     series = {Ast\'erisque},
     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), 5 p. http://archive.numdam.org/item/AST_1987__147-148__259_0/

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