Chow, Shui-Nee. Li, Chengzhi. Wang, Duo.
Normal Forms and Bifurcation of Planar Vector Fields - Cambridge CUP 1994 - 472p
0 521 37226 7
517.53 CHOW
Normal Forms and Bifurcation of Planar Vector Fields - Cambridge CUP 1994 - 472p
0 521 37226 7
517.53 CHOW