@article{JLT_2005_15_1_JLT_2005_15_1_a6,
     author = {I. A. Garc�a and H. Giacomini and J. Gin� },
     title = {Generalized {Nonlinear} {Superposition} {Principles} for {Polynomial} {Planar} {Vector} {Fields}},
     journal = {Journal of Lie theory},
     pages = {89--104},
     publisher = {mathdoc},
     volume = {15},
     number = {1},
     year = {2005},
     url = {http://geodesic.mathdoc.fr/item/JLT_2005_15_1_JLT_2005_15_1_a6/}
}