E. N. Kovalenko, O. N. Yunakova, and N. N. Yunakov, Exciton absorption spectra of thin films of RbCu₂Cl₃ and Rb₂Cu₃Cl₅ ternary compounds, Low Temp. Phys. 47, (2021) [Fiz. Nizk. Temp. 47, 462-467, (2021)] DOI: https://doi.org/10.1063/10.0004238.