K.A. Yagotintsev, Yu.E. Stetsenko, I.V. Legchenkova, A.I. Prokhvatilov, M.A. Strzhemechny, E. Schafler, and M. Zehetbauer, Process of intercalation of C₆₀ with molecular hydrogen from XRD data, Low Temp. Phys. 35, (2009) [Fiz. Nizk. Temp. 35, 315-319, (2009)] DOI: https://doi.org/10.1063/1.3081158.