中国科学院数学与系统科学研究院期刊网
Relative Yetter-Drinfel'd Modules and Twisted Hopf Modules as well as Their Flmdamental Structure Theorems
Liang Yun ZHANG(1),Jia Gui ZHU
Acta Mathematica Sinica, Chinese Series . 2003, (6): 1143 -115 .  DOI: 10.12386/A2003sxxb0152