Template:Hsiang&Levine&Szczarba1965
From Manifold Atlas
W. Hsiang, J. Levine and R. H. Szczarba, On the normal bundle of a homotopy sphere embedded in Euclidean space, Topology 3 (1965), 173–181. MR0175138 (30 #5323) Zbl 0127.13702
