中国科学院数学与系统科学研究院期刊网
The Unfoldings of Equivariant Two-Parameter Bifurcation Problems
Bing LI(1),Xiang Zheng QIAN(2)
Acta Mathematica Sinica, Chinese Series . 2001, (2): 377 -384 .  DOI: 10.12386/A2001sxxb0050