%0 Journal Article %A Dotsenko, Vladimir %A Markl, Martin %A Remm, Elisabeth %T Non-Koszulness of Operads and Positivity of Poincaré Series %J Documenta mathematica %D 2020 %P 309-328 %V 25 %I mathdoc %U http://geodesic.mathdoc.fr/item/DOCMA_2020__25__a59/ %G en %F DOCMA_2020__25__a59