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@article{JRAM_1989__398_153140, author = {Michael W. Smiley}, title = {Breathers and forced oscillations of nonlinear wave equations on {R3.}}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {25--35}, publisher = {mathdoc}, volume = {398}, year = {1989}, zbl = {0666.35066}, url = {http://geodesic.mathdoc.fr/item/JRAM_1989__398_153140/} }
Michael W. Smiley. Breathers and forced oscillations of nonlinear wave equations on R3.. Journal für die reine und angewandte Mathematik, Tome 398 (1989), pp. 25-35. http://geodesic.mathdoc.fr/item/JRAM_1989__398_153140/