Gerth, Frank (1980). “The ideal class groups of two cyclotomic fields”. 《Proceedings of the American Mathematical Society》 (영어) 78: 321–322. doi:10.1090/S0002-9939-1980-0553367-5. MR553367.
Gerth, Frank (1980). “The ideal class groups of two cyclotomic fields”. 《Proceedings of the American Mathematical Society》 (영어) 78: 321–322. doi:10.1090/S0002-9939-1980-0553367-5. MR553367.