参考文献

Z. I. Borevich and I. R. Shafarevich, Number Theory, 閲覧日 2020-11-30, https://www.maths.ed.ac.uk/~v1ranick/papers/borevich.pdf
Z. I. Borevich and I. R. Shafarevich, Number Theory, Academic Press, 1966, pp.368-377
KEITH CONRAD, KUMMER'S LEMMA, 閲覧日 2020-11-30, https://kconrad.math.uconn.edu/blurbs/gradnumthy/kummer.pdf