エキゾチック R4
ISBN 3-540-51148-2
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Freedman, Michael H.; Quinn, Frank (1990). Topology of 4-manifolds. Princeton Mathematical Series. 39. Princeton, NJ: Princeton University Press. ISBN 0-691-08577-3. https://archive.org/details/topologyof4manif0000free
Freedman, Michael H.; Taylor, Laurence R. (1986). “A universal smoothing of four-space”. Journal of Differential Geometry 24 (1): 69–78. doi:10.4310/jdg/1214440258. ISSN 0022-040X. MR857376. https://projecteuclid.org/euclid.jdg/1214440258.
Kirby, Robion C. (1989). The topology of 4-manifolds. Lecture Notes in Mathematics. 1374. Berlin: Springer-Verlag.