On the four-vertex theorem.
Pinkall, U.
Aequationes mathematicae, Tome 33 (1987), p. 221-230 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1987-01-01
EUDML-ID : urn:eudml:doc:137241 
@article{GDZPPN002036975,
     title = {On the four-vertex theorem.},
     journal = {Aequationes mathematicae},
     volume = {33},
     year = {1987},
     pages = {221-230},
     zbl = {0635.53003},
     url = {http://dml.mathdoc.fr/item/GDZPPN002036975}
}

Pinkall, U. On the four-vertex theorem.. Aequationes mathematicae, Tome 33 (1987) pp. 221-230. http://gdmltest.u-ga.fr/item/GDZPPN002036975/