@article{10_2298_TAM181215001F,
     author = {A. T. Fomenko and V. V. Vedyushkina},
     title = {Singularities of integrable {Liouville} systems, reduction of integrals to lower degree and topological billiards: recent results},
     journal = {Theoretical and applied mechanics},
     pages = {47 },
     year = {2019},
     volume = {46},
     number = {1},
     doi = {10.2298/TAM181215001F},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.2298/TAM181215001F/}
}