@article{10_1017_S001708950000611X,
     author = {Iwaniec, Henryk},
     title = {Character sums and small eigenvalues for {{\CYRG}0(p)}},
     journal = {Glasgow mathematical journal},
     pages = {99--116},
     year = {1985},
     volume = {26},
     doi = {10.1017/S001708950000611X},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S001708950000611X/}
}