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E.V. Gomonay and V.M. Loktev, Shift of close-packed basal planes as an order parameter of transitions between antiferromangetic phases in solid oxygen: II. Temperature/pressure dependence of sound velocities and lattice parameters: Classical Cryocrystals, Low Temp. Phys. 33, (2007) [Fiz. Nizk. Temp. 33, 711-718, (2007)] DOI: https://doi.org/10.1063/1.2746247.