@article{IM_1986__84_143336,
     author = {A.J. Sieradski},
     title = {Combinatorial squashings, 3-manifolds, and the third homology of groups.},
     journal = {Inventiones mathematicae},
     pages = {121--140},
     publisher = {mathdoc},
     volume = {84},
     year = {1986},
     zbl = {0604.57001},
     url = {http://geodesic.mathdoc.fr/item/IM_1986__84_143336/}
}