@article{1104252682,
author = {Sigal, I. M.},
title = {Nonlinear wave and Schr\"odinger equations. I. Instability of periodic and quasiperiodic solutions},
journal = {Comm. Math. Phys.},
volume = {151},
number = {1},
year = {1993},
pages = { 297-320},
language = {en},
url = {http://dml.mathdoc.fr/item/1104252682}
}
Sigal, I. M. Nonlinear wave and Schrödinger equations. I. Instability of periodic and quasiperiodic solutions. Comm. Math. Phys., Tome 151 (1993) no. 1, pp. 297-320. http://gdmltest.u-ga.fr/item/1104252682/