TY  - DATA
AU  - Freddy Dumortier, Robert Roussarie, Jorge Sotomayor, Henryk Zoladek
TI  - Bifurcations of Planar Vector Fields
SN  - 9783540384335
PY  - 1991///
PB  - Springer Berlin Heidelberg
KW  - Mathematics and Statistics
UR  - https://doi.org/10.1007/BFb0098353
ER  -