TY - JOUR AU - E. V. Ferapontov TI - Several conjectures and results in the theory of integrable Hamiltonian systems of hydrodynamic type, which do not possess Riemann invariants JO - Teoretičeskaâ i matematičeskaâ fizika PY - 1994 SP - 257 EP - 262 VL - 99 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TMF_1994_99_2_a11/ LA - en ID - TMF_1994_99_2_a11 ER -