MathSciNet bibliographic data MR2161824 51M05 (46B04) Zaks, Joseph On mappings of $\Bbb Q^d$$\Bbb Q^d$ to $\Bbb Q^d$$\Bbb Q^d$ that preserve distances 1 and $\sqrt 2$$\sqrt 2$ and the Beckman-Quarles theorem. J. Geom. 82 (2005), no. 1-2, 195–203. Article

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