@article {2006,
	title = {Radial solutions concentrating on spheres of nonlinear Schr{\"o}dinger equations with vanishing potentials},
	journal = {Proc. Roy. Soc. Edinburgh Sect. A 136 (2006) 889-907},
	number = {SISSA;38/2005/M},
	year = {2006},
	abstract = {We prove the existence of radial solutions of 1.2) concentrating at a sphere for potentials which might be zero and might decay to zero at\\r\\ninfinity. The proofs use a perturbation technique in a variational setting, through a Lyapunov-Schmidt reduction.},
	doi = {10.1017/S0308210500004789},
	url = {http://hdl.handle.net/1963/1755},
	author = {Antonio Ambrosetti and David Ruiz}
}
