@article {2004,
	title = {Singularity perturbed elliptic equations with symmetry: existence of solutions concetrating on spheres, Part II},
	journal = {Indiana Univ. Math. J. 53 (2004) 297-392},
	number = {SISSA;93/2002/M},
	year = {2004},
	publisher = {Indiana University Mathematics Journal},
	doi = {10.1512/iumj.2004.53.2400},
	url = {http://hdl.handle.net/1963/1663},
	author = {Antonio Ambrosetti and Andrea Malchiodi and Wei-Ming Ni}
}
