%0 Journal Article %A Alberto De Sole %A Victor G. Kac %A Daniele Valeri %T Structure of classical (finite and affine) $\mathcal W$-algebras %J Journal of the European Mathematical Society %D 2016 %P 1873-1908 %V 18 %N 9 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4171/jems/632/ %R 10.4171/jems/632 %F JEMS_2016_18_9_a0