Marilena Barnabei Flavio Bonetti Matteo Silimbani The descent statistic on involutions is not log-concave. 11-16 2009 30 Eur. J. Comb. 1 http://dx.doi.org/10.1016/j.ejc.2008.03.003 db/journals/ejc/ejc30.html#BarnabeiBS09