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N.B. Ivanova, M.S. Platunov, Yu.V. Knyazev, N.V. Kazak, L.N. Bezmaternykh, E.V. Eremin, and A.D. Vasiliev, Spin-glass magnetic ordering in CoMgGaO2BO3 ludwigite, Low Temp. Phys. 38, (2011) [Fiz. Nizk. Temp. 38, 214-217, (2011)] DOI: https://doi.org/10.1063/1.3679627.