Template:Kervaire&Milnor1961
From Manifold Atlas
M. A. Kervaire and J. W. Milnor, On -spheres in -manifolds, Proc. Nat. Acad. Sci. U.S.A. 47 (1961), 1651–1657. MR0133134 (24 #A2968) Zbl 0107.40303