@article {doi:10.1142/S0218202509003589,
	title = {Solutions of the Schr{\"o}dinger{\textendash}Poisson problem concentrating on spheres, part I: necessary conditions},
	journal = {Mathematical Models and Methods in Applied Sciences},
	volume = {19},
	number = {05},
	year = {2009},
	pages = {707-720},
	abstract = {<p>In this paper we study a coupled nonlinear Schr{\"o}dinger{\textendash}Poisson problem with radial functions. This system has been introduced as a model describing standing waves for the nonlinear Schr{\"o}dinger equations in the presence of the electrostatic field. We provide necessary conditions for concentration on sphere for the solutions of this kind of problem extending the results already known.</p>},
	doi = {10.1142/S0218202509003589},
	url = {https://doi.org/10.1142/S0218202509003589},
	author = {Ianni, Isabella and Giusi Vaira}
}
@article {ianni2008concentration,
	title = {On concentration of positive bound states for the Schr{\"o}dinger-Poisson problem with potentials},
	journal = {Advanced nonlinear studies},
	volume = {8},
	number = {3},
	year = {2008},
	pages = {573{\textendash}595},
	publisher = {Advanced Nonlinear Studies, Inc.},
	abstract = {<p>We study the existence of semiclassical states for a nonlinear Schr{\"o}dinger-Poisson system that concentrate near critical points of the external potential and of the density charge function. We use a perturbation scheme in a variational setting, extending the results in [1]. We also discuss necessary conditions for concentration.</p>},
	doi = {10.1515/ans-2008-0305.},
	author = {Ianni, Isabella and Giusi Vaira}
}
