@article{IIGUM_2020_33_a1,
     author = {V. D. Irtegov and T. N. Titorenko},
     title = {On invariant sets for the equations of motion of a rigid body in the {Hess--Appelrot} case},
     journal = {The Bulletin of Irkutsk State University. Series Mathematics},
     pages = {20--34},
     publisher = {mathdoc},
     volume = {33},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IIGUM_2020_33_a1/}
}