• First Integrals and Normal Forms for Germs of Analytic Vector Fields 

      Chen, Jian; Yi, Yingfei; Zhang, Xiang (Georgia Institute of Technology, 2006)
      For a germ of analytic vector fields, the existence of first integrals, resonance and the convergence of normalization transforming the vector field to a normal form are closely related. In this paper we first provide a ...