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References to 'Euler's criterion'
1. cases when minus one is a quadratic residue by alozano
2. cubic reciprocity law by mathcam
3. Gauss' lemma by drini
4. Legendre symbol by alozano
5. proof of Thue's Lemma by mathcam
6. properties of the Legendre symbol by alozano
7. representing primes as $x^2+ny^2$ by rm50
8. Zolotarev's lemma by mathcam