%0 Journal Article
%A J. Lewis
%A D. Zagier
%T Period functions for Maass wave forms. I.
%J Annals of mathematics
%D 2001
%V 153
%N 1
%U http://geodesic.mathdoc.fr/articles/10.2307/2661374/
%R 10.2307/2661374
%F 10_2307_2661374