@article{IM_1994__115_1_144179,
     author = {Shaun Bullett and Christopher Penrose},
     title = {Mating quadratic maps with the modular group.},
     journal = {Inventiones mathematicae},
     pages = {483--512},
     publisher = {mathdoc},
     volume = {115},
     number = {1},
     year = {1994},
     zbl = {0801.30025},
     url = {http://geodesic.mathdoc.fr/item/IM_1994__115_1_144179/}
}