no. 1
Blow-up solutions and strong instability of standing waves for the generalized Davey-Stewartson system in ℝ 2
Annales de l'I.H.P. Physique théorique, Tome 63 (1995) no. 1, pp. 111-117. 
@article{AIHPA_1995__63_1_111_0,
     author = {Ohta, Masahito},
     title = {Blow-up solutions and strong instability of standing waves for the generalized {Davey-Stewartson} system in $\mathbb {R}^2$},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {111--117},
     publisher = {Gauthier-Villars},
     volume = {63},
     number = {1},
     year = {1995},
     mrnumber = {1354441},
     zbl = {0832.35132},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPA_1995__63_1_111_0/}
}
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Ohta, Masahito. Blow-up solutions and strong instability of standing waves for the generalized Davey-Stewartson system in $\mathbb {R}^2$. Annales de l'I.H.P. Physique théorique, Tome 63 (1995) no. 1, pp. 111-117. http://archive.numdam.org/item/AIHPA_1995__63_1_111_0/

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[2] R. Cipolatti, On the instability of ground states for a Davey-Stewarston system, Ann. Inst. Henri Poincaré, Phys. Théor., Vol. 58, 1993, pp. 85-104. | Numdam | MR | Zbl

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[5] M. Ohta, Instability of standing waves for the generalized Davey-Stewartson system, Ann. Inst. Henri Poincaré, Phys. Théor. (to appear). | Numdam | MR | Zbl

[6] M. Ohta, Stability and instability of standing waves for the generalized Davey-Stewartson system, Differential and Integral Eqs. (to appear). | MR | Zbl