@article{IM_1970__10_142021,
     author = {P.J. KAHN},
     title = {Codimension-One {Imbedded} {Spheres}},
     journal = {Inventiones mathematicae},
     pages = {44--56},
     publisher = {mathdoc},
     volume = {10},
     year = {1970},
     zbl = {0184.48603},
     url = {http://geodesic.mathdoc.fr/item/IM_1970__10_142021/}
}