1. A. Ambrosetti and A. Malchiodi,Perturbation Methods and Semilinear Elliptic Problems onℝn,Progress in Mathematics240. Binkäuser, Verlag (2006).
2. Ambrosetti A., Malchiodi A. and Secchi S., Multiplicity results for some nonlinear Schrödinger equations with potentials.Arch. Rational Mech. Anal.159(2001) 253–271.
3. Arioli G. and Szulkin A., A semilinear Schrödinger equation in the presence of a magnetic field.Arch. Rational Mech. Anal.170(2003) 277–295.
4. Bahri A. and Lions P.L., On the existence of a positive solution of semilinear elliptic equations in unbounded domains.Ann. Inst. H. Poincaré Anal. Non Linéaire14(1997) 365–413.
5. Bartsch T., Dancer E.N. and Peng S., On multi-bump semi-classical bound states of nonlinear Schrödinger euqations with electromagnetic fields.Adv. Differential Equations7(2006) 781–812.