Carlet G., “The extended bigraded Toda hierarchy”, J. Phys. A, 39:30 (2006), 9411–9435
Xue Ting, Zhang Youjin, “Bihamiltonian systems of hydrodynamic type and reciprocal transformations”, Lett. Math. Phys., 75:1 (2006), 79–92
Liu Si-Qi, Zhang Youjin, “Deformations of semisimple bihamiltonian structures of hydrodynamic type”, J. Geom. Phys., 54:4 (2005), 427–453
Dubrovin B., Zhang Y.J., “Virasoro symmetries of the extended Toda hierarchy”, Comm Math Phys, 250:1 (2004), 161–193
G. Carlet, “Extended Toda Lattice”, Theoret. and Math. Phys., 137:1 (2003), 1390–1395