V. A. Kulbachinskii, N. S. Ezhikov, R. A. Lunin, and B. M. Bulychev, Synthesis and superconductivity of organometallic fullerides M_(3–n)(NR₄)_(n)C₆₀, where M = K, Rb; R = H, D, Me, Et, Bu; n = 1, 2, , Low Temp. Phys. 47, (2020) [Fiz. Nizk. Temp. 47, 46-57, (2020)] DOI: https://doi.org/10.1063/10.0002896.