>>391
補足
下記がよくまとまっている
http://en.wikipedia.org/wiki/Exotic_sphere#CITEREFAkbulut2009

External links

Exotic sphere home page on the home page of Andrew Ranicki. Assorted source material relating to exotic spheres. http://www.maths.ed.ac.uk/~aar/exotic.htm

http://www.maths.ed.ac.uk/~aar/exotic.htm
Exotic spheres
An exotic sphere is an n-dimensional differentiable manifold which is homeomorphic but not diffeomorphic to the standard n-sphere Sn.
The articles on exotic spheres on the Wikipedia and the Manifold Atlas Project.
On manifolds homeomorphic to the 7-sphere, by J.Milnor, Ann. of Math. (2) 64, 399--405 (1956) http://www.maths.ed.ac.uk/~aar/papers/exotic.pdf
Hedrick Lectures on Differential Topology by J. Milnor (1965)
略
The structure set by A.Ranicki, Chapter 13 of Algebraic and Geometric Surgery, Oxford (2002)
Exotic spheres and curvature by M.Joachim and D.J.Wraith, Bull. A.M.S. 45, 595--616 (2008)
A minimal Brieskorn 5-sphere in the Gromoll-Meyer sphere and its applications. by C.Duran and T.Puttmann, Michigan Math. J. 56, 419--451 (2008)
On the work of Michel Kervaire in surgery and knot theory by A.Ranicki, Slides of lecture given at Kervaire memorial symposium, Geneva, 10-12 February, 2009.
Addendum Exotic spheres and the Kervaire invariant (8 May 2009)
An introduction to exotic spheres and singularities by A.Ranicki, Slides of lecture given in Edinburgh, 4 May 2012
Dusa McDuff and Jack Milnor (Somewhere in Scotland, 2011)