Ioannis Goulatis and Alexander Chroneos, Lanthanide doping and external parameters in RBa₂Cu₃O_7–δ superconductors: A brief review, Low Temp. Phys. 49, 486–492, (2023) [Fiz. Nyzk. Temp. 49, 527–534, (2023)] DOI: https://doi.org/10.1063/10.0017594.