@article{RM_1989_44_2_a8,
     author = {L. M. Lerman},
     title = {On the behaviour of {a~Hamiltonian} system in a~neighbourhood 
},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {285--286},
     publisher = {mathdoc},
     volume = {44},
     number = {2},
     year = {1989},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1989_44_2_a8/}
}