@article{DANMA_2020_493_a7,
     author = {A. V. Podobryaev},
     title = {Coadjoint orbits of three-step free nilpotent {Lie} groups and time-optimal control problem},
     journal = {Doklady Rossijskoj akademii nauk. Matematika, informatika, processy upravleni\^a},
     pages = {38--41},
     year = {2020},
     volume = {493},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DANMA_2020_493_a7/}
}