@article {2006,
	title = {Bound states of Nonlinear Schroedinger Equations with  Potentials Vanishing at Infinity},
	journal = {J. Anal. Math. 98 (2006) 317-348},
	number = {SISSA;18/2005/M},
	year = {2006},
	doi = {10.1007/BF02790279},
	url = {http://hdl.handle.net/1963/1756},
	author = {Antonio Ambrosetti and Andrea Malchiodi and David Ruiz}
}
