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V.A. Gasparov, Recent observation of anomalous superconducting behavior of ultrathin YBCO films and single crystals of cluster borides, Low Temp. Phys. 32, (2006) [Fiz. Nizk. Temp. 32, 1105-114, (2006)] DOI: https://doi.org/10.1063/1.2219506.