中国科学院数学与系统科学研究院期刊网
AMS
A Construction of Cryptogroups
Guang Tian SONG, Guo Xin LI, Jian Gang ZHANG
Acta Mathematica Sinica . 2007, (5): 789 -798 .  DOI: 10.1007/s10114-005-0802-3