%0 Journal Article %A A. T. Fomenko %A V. V. Vedyushkina %T Singularities of integrable Liouville systems, reduction of integrals to lower degree and topological billiards: recent results %J Theoretical and applied mechanics %D 2019 %P 47 %V 46 %N 1 %U http://geodesic.mathdoc.fr/articles/10.2298/TAM181215001F/ %R 10.2298/TAM181215001F %G en %F 10_2298_TAM181215001F