A.I. Erenburg, A.V. Leont’eva, V.N. Varyukhin, G.A. Marinin, and A.Yu. Prokhorov, The internal friction and phase transition of solid oxygen, Low Temp. Phys. 37, (2011) [Fiz. Nizk. Temp. 37, 539-542, (2011)] DOI: https://doi.org/10.1063/1.3605699.