@article{IM_1990__101_2_143806,
     author = {Linda Keen and Lisa R. Goldberg},
     title = {The mapping class group of a generic quadratic rational map and automorphisms of the 2-shift.},
     journal = {Inventiones mathematicae},
     pages = {335--372},
     publisher = {mathdoc},
     volume = {101},
     number = {2},
     year = {1990},
     zbl = {0715.58018},
     url = {http://geodesic.mathdoc.fr/item/IM_1990__101_2_143806/}
}