(1)
N. S. Ezhikov, B. M. Bulychev, R. A. Lunin, and V. A. Kulbachinskii, Superconductivity of potassium and rubidium heterofullerides modified with low-melting alloys, Low Temp. Phys. 47, (2020) [Fiz. Nizk. Temp. 47, 58-61, (2020)] DOI: https://doi.org/10.1063/10.0002897.