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Y. O. Nikolaieva, A. O. Olashyn, Y. I. Kuriatnikov, S. I. Vilchynskii, and A. I. Yakimenko, Stable vortex in Bose–Einstein condensate dark matter, Low Temp. Phys. 47, (2021) [Fiz. Nizk. Temp. 47, 744-752, (2021)] DOI: https://doi.org/10.1063/10.0005557.