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D.A. Iakushev, N.M. Makarov, and F. Pérez-Rodríguez, Narrow-pass-band filters based on binary superlattices with strong impedance contrast, Low Temp. Phys. 43, (2017) [Fiz. Nizk. Temp. 43, 1141-1145, (2017)] DOI: https://doi.org/10.1063/1.5001289.