%0 Journal Article %A Iwaniec, Henryk %T Character sums and small eigenvalues for Г0(p) %J Glasgow mathematical journal %D 1985 %P 99-116 %V 26 %U http://geodesic.mathdoc.fr/articles/10.1017/S001708950000611X/ %R 10.1017/S001708950000611X %F 10_1017_S001708950000611X