@article{MAN_1993__295_1_165040,
     author = {Walter D. Neumann and Alan W. Reid},
     title = {Rigidity of cusps in deformations of hyperbolic 3-orbifolds.},
     journal = {Mathematische Annalen},
     pages = {223--238},
     publisher = {mathdoc},
     volume = {295},
     number = {1},
     year = {1993},
     zbl = {0813.57013},
     url = {http://geodesic.mathdoc.fr/item/MAN_1993__295_1_165040/}
}