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Hiroyuki Katsuki, Mizuho Fushitani, and Takamasa Momose, Quantum property of solid hydrogen as revealed by high-resolution laser spectroscopy: Spectroscopy in Cryocrystals and Matrices, Low Temp. Phys. 29, (2003) [Fiz. Nizk. Temp. 29, 1093-1100, (2003)] DOI: https://doi.org/10.1063/1.1619353.