John Milnor, Differential topology, chapter 6 in T. L. Saaty (ed.) Lectures On Modern Mathematic II 1964 (pdf)
John Milnor, Topology from the differential viewpoint, Princeton University Press, 1997. (ISBN:9780691048338, pdf)
On exotic 7-spheres:
On Hopf algebras:
On the cobordism ring:
On invariant Riemannian metrics on (compact) Lie groups:
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