References

1. W.J. Gilbert & W.K. Nicholson (2004): Modern Algebra with Applications. Pure and Applied Mathematics: A Wiley Series of Texts, Monographs and Tracts. Wiley.
2. Charles Robert Hadlock (1975): Field Theory and its Classical Problems 19. Mathematical Association of America, doi:10.1017/CBO9781614440192.
3. Joel H. Shapiro (1999): Quadratic Extension Fields and Geometric Impossibilities. Available at https://users.math.msu.edu/users/shapiro/Pubvit/Downloads/QuadExtn/quadxtn.html.

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