Geodesic
A Note on the Two-Square Theorem
Canadian mathematical bulletin, Tome 20 (1977) no. 1, pp. 93-94

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One of the nicest theorems of elementary number theory is the two-square theorem of Fermat. A prime p is expressible as the sum of 2 squares if and only if -1 is a quadratic residue mod p. 
Fine, Benjamin. A Note on the Two-Square Theorem. Canadian mathematical bulletin, Tome 20 (1977) no. 1, pp. 93-94. doi: 10.4153/CMB-1977-015-2
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     title = {A {Note} on the {Two-Square} {Theorem}},
     journal = {Canadian mathematical bulletin},
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     year = {1977},
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     number = {1},
     doi = {10.4153/CMB-1977-015-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1977-015-2/}
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