MathSciNet bibliographic data MR2644908 (2011i:57034) 57R10 (57M60 57R57) Nakamura, Nobuhiro Smoothability of $\Bbb Z\times\Bbb Z$$\Bbb Z\times\Bbb Z$-actions on 4-manifolds. Proc. Amer. Math. Soc. 138 (2010), no. 8, 2973–2978. Article

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