@article{IM2_1983_21_2_a8,
     author = {N. T. Tynyanskii and A. V. Arutyunov},
     title = {On the system of {Jacobi} equations in a~time-optimal problem},
     journal = {Izvestiya. Mathematics},
     pages = {375--397},
     year = {1983},
     volume = {21},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1983_21_2_a8/}
}