@article{IM_1980__62_142781,
     author = {B.A. Kupershmidt and George Wilson},
     title = {Modifying {Lax} {Equations} and the {Second} {Hamiltonian} {Structure.}},
     journal = {Inventiones mathematicae},
     pages = {403--436},
     publisher = {mathdoc},
     volume = {62},
     year = {1980},
     zbl = {0464.35024},
     url = {http://geodesic.mathdoc.fr/item/IM_1980__62_142781/}
}