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D. Opherden, F. Bärtl, M. S. J. Tepaske, C. P. Landee, J. Wosnitza, and H. Kühne, Berezinskii–Kosterlitz–Thouless correlations in copper-based quasi-2D spin systems, Low Temp. Phys. 49, (2023) [Fiz. Nyzk. Temp. 49, 899–907, (2023)] DOI: https://doi.org/10.1063/10.0019692.