MathSciNet bibliographic data MR701256 57M99 (57S05) Hatcher, Allen E. A proof of the Smale conjecture, ${\rm Diff}(S\sp{3})\simeq {\rm O}(4)$${\rm Diff}(S\sp{3})\simeq {\rm O}(4)$. Ann. of Math. (2) 117 (1983), no. 3, 553–607. Article

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