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References to 'sums of two squares'
1. application of fundamental theorem of integral calculus by pahio
2. finite projective plane by Mathprof
3. incidence structure by CWoo
4. proof of Lagrange's four-square theorem by CWoo
5. proof of Thue's Lemma by mathcam
6. Pythagorean field by CWoo
7. Pythagorean prime by PrimeFan
8. representing primes as $x^2+ny^2$ by rm50
9. Thue's lemma by mathcam