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V. N. Krivoruchko and V. Yu. Tarenkov, Collective excitations of two-phase Bi2223 and Bi2212 superconducting condensates in Bi-based high-temperature superconductors , Low Temp. Phys. 52, 1312–1316, (2026) [Fiz. Nyzk. Temp. 52, 1458–1462, (2026)] DOI: https://doi.org/10.1063/10.0046881.