@article{IM_1995__122_3_144330,
     author = {Peter Teichner and Michael H. Freedman},
     title = {4-Manifold topology {I:} {Subexponential} groups.},
     journal = {Inventiones mathematicae},
     pages = {509--530},
     publisher = {mathdoc},
     volume = {122},
     number = {3},
     year = {1995},
     zbl = {0857.57017},
     url = {http://geodesic.mathdoc.fr/item/IM_1995__122_3_144330/}
}