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References to 'quartic formula'
1. biquadratic equation by pahio
2. Euler's derivation of the quartic formula by pahio
3. Ferrari-Cardano derivation of the quartic formula by djao
4. quadratic resolvent by pahio
5. root by mathcam
6. symmetric quartic equation by pahio
7. topics on field extensions and Galois theory by rm50
8. topics on polynomials by matte