@article{DBLP:journals/jct/Spencer81a,
author = {Joel Spencer},
title = {Balancing Unit Vectors},
journal = {J. Comb. Theory, Ser. A},
volume = {30},
number = {3},
year = {1981},
pages = {349-350},
ee = {http://dx.doi.org/10.1016/0097-3165(81)90033-9},
bibsource = {DBLP, http://dblp.uni-trier.de}
}