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O. M. Bahrova, L. Y. Gorelik, and S. I. Kulinich, Entanglement between charge qubit states and coherent states of nanomechanical resonator generated by ac Josephson effect , Low Temp. Phys. 47, (2021) [Fiz. Nizk. Temp. 47, 315-321, (2021)] DOI: https://doi.org/10.1063/10.0003739.