A combinatorial invariant that characterizes normal immersions of $S\sp{1}$ into $R\sp{2}$
Marx, Morris L.
Duke Math. J., Tome 41 (1974) no. 1, p. 145-149 / Harvested from Project Euclid
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Publié le : 1974-03-14
Classification:  57A50 
@article{1077310233,
     author = {Marx, Morris L.},
     title = {A combinatorial invariant that characterizes normal immersions
 of $S\sp{1}$ 
 into $R\sp{2}$},
     journal = {Duke Math. J.},
     volume = {41},
     number = {1},
     year = {1974},
     pages = { 145-149},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1077310233}
}

Marx, Morris L. A combinatorial invariant that characterizes normal immersions
 of $S\sp{1}$ 
 into $R\sp{2}$. Duke Math. J., Tome 41 (1974) no. 1, pp.  145-149. http://gdmltest.u-ga.fr/item/1077310233/