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Vladimir E. Bondybey and Elena V. Savchenko, 4th International Conference on Cryocrystals and Quantum Crystals (CC 2002): High-Pressure Studies, Low Temp. Phys. 29, (2003) [Fiz. Nizk. Temp. 29, 939-940, (2003)] DOI: https://doi.org/10.1063/1.1614171.