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@article{CMH_1996__71_2_140400, author = {J\"urgen P\"oschel}, title = {Quasi-periodic solutions for a nonlinear wave equation.}, journal = {Commentarii mathematici Helvetici}, pages = {269--296}, publisher = {mathdoc}, volume = {71}, number = {2}, year = {1996}, zbl = {0866.35013}, url = {http://geodesic.mathdoc.fr/item/CMH_1996__71_2_140400/} }
Jürgen Pöschel. Quasi-periodic solutions for a nonlinear wave equation.. Commentarii mathematici Helvetici, Tome 71 (1996) no. 2, pp. 269-296. http://geodesic.mathdoc.fr/item/CMH_1996__71_2_140400/