@article{10_4064_ap_40_1_95_104,
     author = {Ronald A. Knight},
     title = {Certain closed flows on a 2-manifold},
     journal = {Annales Polonici Mathematici},
     pages = {95--104},
     publisher = {mathdoc},
     volume = {40},
     number = {1},
     year = {1981},
     doi = {10.4064/ap-40-1-95-104},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-40-1-95-104/}
}