中国科学院数学与系统科学研究院期刊网
The Class Number of the Field Q(P_1~(1/2),…,P_t~(1/2))(t≥4) Is Even
Yan Ming DI
Acta Mathematica Sinica, Chinese Series . 2001, (1): 125 -130 .  DOI: 10.12386/A2001sxxb0017