@article{VTGU_2020_68_a4,
     author = {S. O. Gladkov and S. B. Bogdanova},
     title = {O the theory of a space brachistochrone},
     journal = {Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mehanika},
     pages = {53--60},
     publisher = {mathdoc},
     number = {68},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VTGU_2020_68_a4/}
}