Masaaki Miki and Takamasa Momose, Rovibrational transitions and nuclear spin conversion of methane in parahydrogen crystals: Low-Temperature Physics and Chemistry in Cryomatrice, Low Temp. Phys. 26, (2000) [Fiz. Nizk. Temp. 26, 899-908, (2000)] DOI: https://doi.org/10.1063/1.1312392.