@article{IM_1984__75_143109,
     author = {P.B. Shalen and M. Culler},
     title = {Bounded, separating, incompressible surfaces in knot manifolds.},
     journal = {Inventiones mathematicae},
     pages = {537--546},
     publisher = {mathdoc},
     volume = {75},
     year = {1984},
     zbl = {0542.57011},
     url = {http://geodesic.mathdoc.fr/item/IM_1984__75_143109/}
}