@article{SIGMA_2012_8_a34,
     author = {Jaume Llibre and Daniel Peralta-Salas},
     title = {A note on the first integrals of vector fields with integrating factors and normalizers},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2012},
     volume = {8},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2012_8_a34/}
}