@article{DAN_1997_354_5_a5,
     author = {S. Yu. Dobrokhotov},
     title = {Hugoniot--Maslov chains for trajectories of point vortex singularities of shallow water equations, and the {Hill} equation},
     journal = {Doklady Akademii Nauk},
     pages = {600--603},
     publisher = {mathdoc},
     volume = {354},
     number = {5},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1997_354_5_a5/}
}