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Original Russian Text © M. V. Tryamkin, 2018, published in Matematicheskie Zametki, 2018, Vol. 104, No. 5, pp. 796–800.
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Tryamkin, M.V. The Sub-Riemannian Curvature of Curves in the Borel Subgroup of the Group SL(2,ℝ). Math Notes 104, 773–777 (2018). https://doi.org/10.1134/S0001434618110226
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DOI: https://doi.org/10.1134/S0001434618110226