@article{MZM_2018_104_5_a19,
     author = {M. V. Tryamkin},
     title = {The {Sub-Riemannian} {Curvature} of {Curves} in the {Borel} {Subgroup} of the {Group} $\mathrm{SL}(2,\mathbb R)$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {796--800},
     publisher = {mathdoc},
     volume = {104},
     number = {5},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2018_104_5_a19/}
}