Geodesic
A nonlocal Hamiltonian formalism for semi-Hamiltonian systems of the hydrodynamic type
Teoretičeskaâ i matematičeskaâ fizika, Tome 116 (1998) no. 1, pp. 113-121 
L. V. Bogdanov; E. V. Ferapontov. A nonlocal Hamiltonian formalism for semi-Hamiltonian systems of the hydrodynamic type. Teoretičeskaâ i matematičeskaâ fizika, Tome 116 (1998) no. 1, pp. 113-121. http://geodesic.mathdoc.fr/item/TMF_1998_116_1_a3/
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     author = {L. V. Bogdanov and E. V. Ferapontov},
     title = {A~nonlocal {Hamiltonian} formalism for {semi-Hamiltonian} systems of the hydrodynamic type},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {113--121},
     year = {1998},
     volume = {116},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1998_116_1_a3/}
}
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A nonlocal Hamiltonian formalism for semi-Hamiltonian systems of the hydrodynamic type is constructed using the formal Baker–Akhiezer functions for a ($2+1$)-dimensional $n$-wave system.

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