N. N. Galtsov, A. I. Prokhvatilov, and M. A. Strzhemechny, Structure characteristics of methane-doped solid normal hydrogen: Low-Temperature Physics and Chemistry in Cryomatrice, Low Temp. Phys. 26, (2000) [Fiz. Nizk. Temp. 26, 918-923, (2000)] DOI: https://doi.org/10.1063/1.1312394.