@article{SM_2020_211_2_a4,
     author = {A. V. Podobryaev},
     title = {Symmetries in left-invariant optimal control problems},
     journal = {Sbornik. Mathematics},
     pages = {275--290},
     publisher = {mathdoc},
     volume = {211},
     number = {2},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2020_211_2_a4/}
}