@article{10_4007_annals_2013_177_3_8,
     author = {Tam\'as Hausel and Emmanuel Letellier and Fernando Rodriguez-Villegas},
     title = {Positivity for  {Kac} polynomials and {DT-invariants} of quivers},
     journal = {Annals of mathematics},
     pages = {1147--1168},
     publisher = {mathdoc},
     volume = {177},
     number = {3},
     year = {2013},
     doi = {10.4007/annals.2013.177.3.8},
     mrnumber = {3034296},
     zbl = {06176990},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4007/annals.2013.177.3.8/}
}