Ideals and Congruences in the Ring of Rational Integers
Harry S. Vandiver, Milo W. Weaver · American Mathematical Monthly · 1958
H. S. Vandiver, Milo W. Weaver, Ideals and Congruences in the Ring of Rational Integers, The American Mathematical Monthly, Vol. 65, No. 8, Part 2: Introduction to Arithmetic Factorization and Congruences from the Standpoint of Abstract Algebra (Oct., 1958), pp. 12-16