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O. Churiukova, A. Jeżowski, P. Stachowiak, J. Mucha, Z. Litwicki, P. Perlin, and T. Suski, Thermal conductivity of donor-doped GaN measured with 3ω and stationary methods: 10th International Conference on Cryocrystals and Quantum Crystals (Final part), Low Temp. Phys. 41, (2017) [Fiz. Nizk. Temp. 41, 725-728, (2017)] DOI: https://doi.org/10.1063/1.4927048 .