@article{VM_1999_1_1_a9,
     author = {Bernd Wegner},
     title = {Tangential {Symmetries} of {Planar} {Curves} and {Space} {Curves}},
     journal = {Visual Mathematics},
     publisher = {mathdoc},
     volume = {1},
     number = {1},
     year = {1999},
     url = {http://geodesic.mathdoc.fr/item/VM_1999_1_1_a9/}
}