@article{VUU_2021_31_1_a6,
     author = {V. V. Voytik and N. G. Migranov},
     title = {Small nutation of a symmetic gyroscope: two viewpoints},
     journal = {Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹ\^uternye nauki},
     pages = {89--101},
     publisher = {mathdoc},
     volume = {31},
     number = {1},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VUU_2021_31_1_a6/}
}