참고문헌
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L. Danielson, B. Fein. On the irreducibility of iterates of
$x^n-b$ , The Americal Math. Soc. 130 (2011), 1589-1596. - R.K.W. Odoni. The Galois theory of iterates and composites of polynomials, Prod. London Math Soc. (3), 51 (3), 1985, 385-414 https://doi.org/10.1112/plms/s3-51.3.385
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R.K.W. Odoni. On the prime divisors of the sequence
$w_{n+1}=1+w_1{\cdot}{\cdot}{\cdot}w_n.$ J. London Math. Soc. 32 (1985), 1-11. https://doi.org/10.1112/jlms/s2-32.1.1