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A. A. Leha, A. P. Zhuravel, A. Karpov, A. V. Lukashenko, and A. V. Ustinov, Phase-resolved visualization of radio-frequency standing waves in superconducting spiral resonator for metamaterial applications, Low Temp. Phys. 48, (2021) [Fiz. Nyzk. Temp. 48, 119-128, (2021)] DOI: https://doi.org/10.1063/10.0009288.