1. Finite Rank Torsion-Free Abelian Groups and Rings;Arnold,1982
2. Algebra, GTM 73;Hungerford,1974
3. Krull–Schmidt theorems in dimension 1;Levy;Trans. Amer. Math. Soc.,1996
4. Package deal theorems and splitting orders in dimension 1;Levy;Trans. Amer. Math. Soc.,1996
5. Number Fields;Marcus,1977