@article{AM_1999_150_3_a1,
     author = {Rita Gitik},
     title = {Doubles of groups and hyperbolic {LERF} $3$-manifolds},
     journal = {Annals of mathematics},
     publisher = {mathdoc},
     volume = {150},
     number = {3},
     year = {1999},
     url = {http://geodesic.mathdoc.fr/item/AM_1999_150_3_a1/}
}