Solovjov, A.; Stepanov, V. B.; Kolesnichenko, Y. A. Comparative Analysis of the Temperature Dependences of the Resistivity, Pseudogap, and Thermoelectric Power in Polycrystals YBa₂Cu₃O_7–δ With a Decrease in the Density of Charge Carriers. Fiz. Nyzk. Temp. 2021, 47, 883-894.