C. V. Savich, O. V. Samojlov, U. Kurbanov, A. L. Solovjov, and R. V. Vovk, Excess conductivity of HTSC ceramics YBa₂Cu₃O_7–δ with TiO₂ impurities, Low Temp. Phys. 48, (2022) [Fiz. Nyzk. Temp. 48, 878–883, (2022)] DOI: https://doi.org/10.1063/10.0014018.