Geodesic
Tensor roots of isomorphisms and weak limits of transformations
Matematičeskie zametki, Tome 80 (2006) no. 4, pp. 596-600.

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We prove that two transformations $S$ and $T$ are isomorphic if their Cartesian squares are isomorphic, under the assumption that the sequence of powers of $T$ converges weakly to a polynomial. 
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V. V. Ryzhikov; A. E. Troitskaya. Tensor roots of isomorphisms and weak limits of transformations. Matematičeskie zametki, Tome 80 (2006) no. 4, pp. 596-600. http://geodesic.mathdoc.fr/item/MZM_2006_80_4_a12/

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