no. 2
Foliation of phase space for the cubic non-linear Schrödinger equation
Compositio Mathematica, Tome 85 (1993) no. 2, pp. 163-199 
@article{CM_1993__85_2_163_0,
     author = {B\"attig, D. and Gr\'ebert, B. and Guillot, J. C. and Kappeler, T.},
     title = {Foliation of phase space for the cubic non-linear {Schr\"odinger} equation},
     journal = {Compositio Mathematica},
     pages = {163--199},
     year = {1993},
     publisher = {Kluwer Academic Publishers},
     volume = {85},
     number = {2},
     mrnumber = {1204779},
     zbl = {0783.35068},
     language = {en},
     url = {https://www.numdam.org/item/CM_1993__85_2_163_0/}
}
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Bättig, D.; Grébert, B.; Guillot, J. C.; Kappeler, T. Foliation of phase space for the cubic non-linear Schrödinger equation. Compositio Mathematica, Tome 85 (1993) no. 2, pp. 163-199. https://www.numdam.org/item/CM_1993__85_2_163_0/

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