00000nam a2200000 a 4500 20251203091927.0 0521372267 515.35, D, Cho Chow, Shui-Nee Normal forms and Bifurcation of planar vector fields Cambridge Cambridge University Press 1994 viii,472p. 22 cm. Normal Forms Bifurcation Theory Vector Fields Li, Chengzhi Wang, Duo Eng _ 86113 LIBSC C 57723 57723 0 0 0 0 PU PU 1998-04-09 0 515.35, D, Cho 86113 BK