%0 Journal Article
%A Ben Heuer
%T Cusps and $q$-expansion principles for modular curves at infinite level
%J Documenta mathematica
%D 2022
%P 2385-2439
%V 27
%U http://geodesic.mathdoc.fr/articles/10.4171/dm/x32/
%R 10.4171/dm/x32
%F 10_4171_dm_x32