MathSciNet bibliographic data MR1152230 57N13 (57R55 57R57) De Michelis, Stefano; Freedman, Michael H. Uncountably many exotic ${\bf R}\sp 4$${\bf R}\sp 4$'s in standard $4$$4$-space. J. Differential Geom. 35 (1992), no. 1, 219–254. Article

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