@article{10_4153_CJM_2004_015_2,
     author = {Llibre, Jaume and Schlomiuk, Dana},
     title = {The {Geometry} of {Quadratic} {Differential} {Systems} with a {Weak} {Focus} of {Third} {Order}},
     journal = {Canadian journal of mathematics},
     pages = {310--343},
     year = {2004},
     volume = {56},
     number = {2},
     doi = {10.4153/CJM-2004-015-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2004-015-2/}
}