@article{ND_2019_15_4_a16,
     author = {A. V. Podobryaev},
     title = {Symmetric {Extremal} {Trajectories} in {Left-Invariant} {Optimal} {Control} {Problems}},
     journal = {Russian journal of nonlinear dynamics},
     pages = {569--575},
     publisher = {mathdoc},
     volume = {15},
     number = {4},
     year = {2019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ND_2019_15_4_a16/}
}