@article{IM_1991__104_1_143895,
     author = {Keith Ball},
     title = {The plank problem for symmetric bodies.},
     journal = {Inventiones mathematicae},
     pages = {535--544},
     publisher = {mathdoc},
     volume = {104},
     number = {1},
     year = {1991},
     zbl = {0702.52003},
     url = {http://geodesic.mathdoc.fr/item/IM_1991__104_1_143895/}
}