@article{MZ_1996__223_3_174943,
     author = {K. Athanassopoulos},
     title = {One-dimensional chain recurrent sets of flows in the 2-sphere.},
     journal = {Mathematische Zeitschrift},
     pages = {643--650},
     publisher = {mathdoc},
     volume = {223},
     number = {3},
     year = {1996},
     zbl = {0872.58051},
     url = {http://geodesic.mathdoc.fr/item/MZ_1996__223_3_174943/}
}