%0 Journal Article %A Abhishek Saha %T On sup-norms of cusp forms of powerful level %J Journal of the European Mathematical Society %D 2017 %P 3549-3573 %V 19 %N 11 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4171/jems/746/ %R 10.4171/jems/746 %F JEMS_2017_19_11_a7