@article{10_4064_ap_73_2_159_168,
     author = {Klaudiusz W\'ojcik},
     title = {Chaos in some planar nonautonomous polynomial differential equation},
     journal = {Annales Polonici Mathematici},
     pages = {159--168},
     publisher = {mathdoc},
     volume = {73},
     number = {2},
     year = {2000},
     doi = {10.4064/ap-73-2-159-168},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-73-2-159-168/}
}