@article{TM_1994_205_a5,
     author = {Nguyen Tien Zung},
     title = {Topological invariants of integrable geodesic flows on the higher-dimensional torus and sphere},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {73--90},
     publisher = {mathdoc},
     volume = {205},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1994_205_a5/}
}