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MR2823093 (2012f:57054) 57Q25 (53C23)
Orshanskiy, Sergey A PL-manifold of nonnegative curvature homeomorphic to $S\sp 2\times S\sp 2$ is a direct metric product. Proc. Amer. Math. Soc. 139 (2011), no. 12, 4475–4486.
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