@article {2002,
	title = {Solutions concentrating on spheres to symmetric singularly perturbed problems},
	journal = {C.R.Math.Acad.Sci. Paris 335 (2002),no.2,145-150},
	number = {SISSA;23/2002/M},
	year = {2002},
	publisher = {SISSA Library},
	abstract = {We discuss some existence results concerning problems (NLS) and (N), proving the existence of radial solutions concentrating on a sphere.},
	doi = {10.1016/S1631-073X(02)02414-7},
	url = {http://hdl.handle.net/1963/1594},
	author = {Antonio Ambrosetti and Andrea Malchiodi and Wei-Ming Ni}
}
