@article{JRAM_1987__373_152891,
     author = {Wojciech Banaszczyk},
     title = {The {Steinitz} constant of the plane.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {218--220},
     publisher = {mathdoc},
     volume = {373},
     year = {1987},
     zbl = {0593.15020},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1987__373_152891/}
}