@article{VMUMM_2011_4_a13,
     author = {D. V. Novikov},
     title = {The topology of isoenergy surfaces for the {Sokolov} integrable case on the {Lie} algebra $\operatorname{so}(3,1)$},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {62--65},
     year = {2011},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2011_4_a13/}
}