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, 3 - V. A. Kulbachinskii; N. S. Ezhikov; R. A. Lunin; B. M. Bulychev (Low Temperature Physics, 2021)