中国科学院数学与系统科学研究院期刊网
AMS
On the Structure of Gradedλ-Hopf Algebras
Jian Hua SUN, Pu ZHANG
Acta Mathematica Sinica . 2009, (1): 95 -108 .  DOI: 10.1007/s10114-008-6146-z