@article{10_4171_dm_748,
     author = {Elisabeth Remm and Vladimir Dotsenko and Martin Markl},
     title = {Non-Koszulness of {Operads} and {Positivity} of {Poincar\'e} {Series}},
     journal = {Documenta mathematica},
     pages = {309--328},
     year = {2020},
     volume = {25},
     doi = {10.4171/dm/748},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/dm/748/}
}