@article{PM_1997_1997_1_a5,
     author = {Freire, Emilio and Ponce, Enrique and Torres, Francisco},
     title = {Bifurcaciones tipo {Hopf} en sistemas lineales planos a trozos.},
     journal = {Publicacions matem\`atiques},
     pages = {135-148},
     publisher = {mathdoc},
     volume = {41},
     number = {1},
     year = {1997},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PM_1997_1997_1_a5/}
}