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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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[1] 1. Fine, Benjamin, Sum of Squares Rings (to appear Canadian Journal of Mathematics). Google Scholar

[2] 2. Hardy, G. H. and Wright, E. M., Introduction to the Theory of Numbers Clarendon Press. Google Scholar

[3] 3. Lehner, Joseph, Discontinuous Groups and Automorphic Functions Math. Surveys No. VIII Amer. Math. Soc. (1964). Google Scholar

[4] 4. Newman, Morris, Integral Matrices Academic Press (1972). Google Scholar

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