%0 Journal Article %A E. V. Ferapontov %T Laplace transformations of hydrodynamic-type systems in Riemann invariants %J Teoretičeskaâ i matematičeskaâ fizika %D 1997 %P 86-97 %V 110 %N 1 %U http://geodesic.mathdoc.fr/item/TMF_1997_110_1_a6/ %G ru %F TMF_1997_110_1_a6