@article{SM_1989_64_2_a7,
     author = {S. B. Kuksin},
     title = {Perturbation theory for quasiperiodic solutions of infinite-dimensional {Hamiltonian} systems, and its application to the {Korteweg--de~Vries} equation},
     journal = {Sbornik. Mathematics},
     pages = {397--413},
     publisher = {mathdoc},
     volume = {64},
     number = {2},
     year = {1989},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1989_64_2_a7/}
}