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M. Palistrant, A. Surdu, V. Ursu, P. Petrenko, and A. Sidorenko, Analytical solutions of the microscopic two-band theory for the temperature dependence of the upper critical fields of pure MgB2 compared with experimental data, Low Temp. Phys. 37, (2011) [Fiz. Nizk. Temp. 37, 567-576, (2011)] DOI: https://doi.org/10.1063/1.3610174.