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@article{MS2_1962__11_165818, author = {Fr. Fabricius-Bjerre}, title = {On the {Double} {Tangents} of {Plane} {Closed} {Curves.}}, journal = {Mathematica Scandinavica}, pages = {113--116}, publisher = {mathdoc}, volume = {11}, year = {1962}, zbl = {0173.50501}, url = {http://geodesic.mathdoc.fr/item/MS2_1962__11_165818/} }
Fr. Fabricius-Bjerre. On the Double Tangents of Plane Closed Curves.. Mathematica Scandinavica, Tome 11 (1962), pp. 113-116. http://geodesic.mathdoc.fr/item/MS2_1962__11_165818/