@article{RM_1987_42_3_a17,
     author = {M. Polyak},
     title = {On~one-dimensional {Hamiltonian} systems of hydrodynamic type with explicit dependence on the spatial variable},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {229--230},
     publisher = {mathdoc},
     volume = {42},
     number = {3},
     year = {1987},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1987_42_3_a17/}
}