1. B. A. Dubrovin and S. P. Novikov, “On Poisson brackets of hydrodynamic type,” Dokl. Akad. Nauk SSSR, 279:2 (1984), 294–297; English transl.: Soviet Math. Dokl., 30 (1984), 651–654.
2. B. A. Dubrovin and S. P. Novikov, “The Hamiltonian formalism of one-dimensional systems of hydrodynamic type and the Bogolyubov-Whitham averaging method,” Dokl. Akad. Nauk SSSR, 270:4 (1983), 781–785; English transl.: Soviet Math. Dokl., 27 (1983), 665–669.
3. S. P. Tsarev, “Geometry of Hamiltonian systems of hydrodynamic type. The generalized hodograph method,” Izv. Akad. Nauk SSSR. Ser. Matem., 54:5 (1990), 1048–1068; English transl.: Math. USSR Izv., 54:5 (1990), 397–419.
4. B. A. Dubrovin and S. P. Novikov, “Hydrodynamics of weakly deformed soliton lattices. Differential geometry and Hamiltonian theory,” Uspekhi Mat. Nauk, 44:6 (1989), 29–98; English transl.: Russian Math. Surveys, 44:6 (1989), 35–124.
5. E. V. Ferapontov and K. R. Khusnutdinova, “On the integrability of (2 + 1)-dimensional quasilinear systems,” Comm. Math. Phys., 248 (2004), 187–206.