TY - JOUR AU - A. T. Fomenko AU - V. V. Vedyushkina TI - Singularities of integrable Liouville systems, reduction of integrals to lower degree and topological billiards: recent results JO - Theoretical and applied mechanics PY - 2019 SP - 47 VL - 46 IS - 1 UR - http://geodesic.mathdoc.fr/articles/10.2298/TAM181215001F/ DO - 10.2298/TAM181215001F LA - en ID - 10_2298_TAM181215001F ER -