Gabriele Bianchi, Daniel A. Klain, Erwin Lutwak, Deane Yang, Gaoyong Zhang. A countable set of directions is sufficient for Steiner symmetrization. Adv. Appl. Math., 47(4):869-873, 2011. [doi]
@article{BianchiKLYZ11,
title = {A countable set of directions is sufficient for Steiner symmetrization},
author = {Gabriele Bianchi and Daniel A. Klain and Erwin Lutwak and Deane Yang and Gaoyong Zhang},
year = {2011},
doi = {10.1016/j.aam.2011.04.005},
url = {https://doi.org/10.1016/j.aam.2011.04.005},
researchr = {https://researchr.org/publication/BianchiKLYZ11},
cites = {0},
citedby = {0},
journal = {Adv. Appl. Math.},
volume = {47},
number = {4},
pages = {869-873},
}