@article{article15996f68,
title   = {Hopf bifurcation at infinity for planar vector fields},
author = {Alarcón, Begoña and Guíñez, Víctor and Vidalon, Carlos Teobaldo Gutierrez},
year = {2007},
doi = {10.3934/dcds.2007.17.247},
journal   = {Discrete and Continuous Dynamical Systems}
}