https://www.kth.se/math/kalender/paolo-salvatore-koszul-self-duality-of-e-n-operads-in-spectra-1.1164170?date=2022-04-28&orgdate=2022-03-21&length=1&orglength=286
Paolo Salvatore: Koszul self-duality of E_n operads in spectra | KTH
paolo salvatoreself duality