@article{DCG_1994__12_1_131338,
     author = {I. B\'ar\'any and A. Heppes},
     title = {On the {Exact} {Constant} in the {Quantitative} {Steinitz} {Theorem} in the {Plane.}},
     journal = {Discrete & computational geometry},
     pages = {387--398},
     publisher = {mathdoc},
     volume = {12},
     number = {1},
     year = {1994},
     zbl = {0817.52011},
     url = {http://geodesic.mathdoc.fr/item/DCG_1994__12_1_131338/}
}