@article{RM_1992_47_4_a16,
     author = {A. A. Prokop'ev},
     title = {Topological invariants of the {Hamiltonian} system for the $B$-phase of superfluid {Helium-3}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {226--227},
     publisher = {mathdoc},
     volume = {47},
     number = {4},
     year = {1992},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1992_47_4_a16/}
}