2 citations to https://www.mathnet.ru/eng/jdde1
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K. A. Afonin, D. V. Treschev, “Entropy of a unitary operator on $L^2(\pmb{\mathbb{T}}^n)$”, Sb. Math., 213:7 (2022), 925–980
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D. V. Treschev, A. O. Chernyshev, “Entropy of a Unitary Operator in $\mathbb C^J$”, Math. Notes, 112:6 (2022), 984–1002