00625nam a2200217 a 450000500170000002000150001708200200003210000190005224500570007126000480012830000230017669000170019969000230021669000180023970000170025770000140027496400190028899700180030799900170032595200650034220251203091927.0  a0521372267  a515.35,bD, Cho  aChow, Shui-Nee  aNormal forms and Bifurcation of planar vector fields  aCambridgebCambridge University Pressc1994  aviii,472p.c22 cm.  aNormal Forms  aBifurcation Theory  aVector Fields  aLi, Chengzhi  aWang, Duo  bEngcdefg_  a86113 LIBSC C  c57723d57723  00104070aPUbPUd1998-04-09l0o515.35, D, Chop86113yBK