@article{cgg-hnaf-14l
, author =        "Colin~de Verdi{\`e}re, {\'E}ric and
                   Ginot, Gr{\'e}gory and Goaoc, Xavier"
, title =         "{H}elly numbers of acyclic families"
, journal =       "Advances in Mathematics"
, volume =        253
, pages =         "163--193"
, year =          2014
, note =          "Preliminary version entitled
                   \emph{Multinerves and {H}elly numbers of acyclic
                   families} in \emph{ACM Symposium on Computational
                   Geometry} 2012. Preprint available at arXiv:1101.6006
                   [math.CO]"
}