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@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/} }
Ronald A. Knight. Certain closed flows on a 2-manifold. Annales Polonici Mathematici, Tome 40 (1981) no. 1, pp. 95-104. doi : 10.4064/ap-40-1-95-104. http://geodesic.mathdoc.fr/articles/10.4064/ap-40-1-95-104/
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