@article{JEMS_2012_14_5_a0,
     author = {Nathan Keller},
     title = {A tight quantitative version of {Arrow{\textquoteright}s} impossibility theorem},
     journal = {Journal of the European Mathematical Society},
     pages = {1331--1355},
     publisher = {mathdoc},
     volume = {14},
     number = {5},
     year = {2012},
     doi = {10.4171/jems/334},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/334/}
}