@article{10_1090_S0894_0347_08_00618_8,
     author = {Borcea, Julius and Br\"and\'en, Petter and Liggett, Thomas},
     title = {Negative dependence and the geometry of polynomials},
     journal = {Journal of the American Mathematical Society},
     pages = {521--567},
     year = {2009},
     volume = {22},
     number = {2},
     doi = {10.1090/S0894-0347-08-00618-8},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-08-00618-8/}
}